Sentinel Ultrasonic Bird, Pigeon, Fox, Cat & Pest Repeller installation instructions and user guide

     Sentinel 4 way ultrasonic cat bird pigeon fox badger repeller deterrent right.jpg                      Sentinel 1 way ultrasonic cat bird pigeon fox badger repeller deterrent side 1

The Sentinel MKII Ultrasonic Pest repeller is weatherproof and designed for indoor or outdoor use. If using outdoors, the plug-in mains power adaptor MUST be plugged into a mains socket inside a building and never exposed to dampness or moisture. Do not remove the front cover of the unit as this will damage the weatherproof seal.

The Ultrasonic repeller is a fully adjustable, self contained module with frequency ranging from approx. 8kHz to 40kHz. At least 50% of this spectrum is in an audible frequency range and can be heard by humans, but the unit can be adjusted to a higher frequency to generate a silent Ultrasonic tone. Most of the successes reported with deterring birds, Pigeons, Mice, Rats, Cats, Dogs, vermin and pests in general have been achieved with unit set to the higher ultrasonic frequencies (silent), so it is sometimes best to experiment with the setting as many different local environmental factors and animal breeding / feeding cycles can effect the overall effectiveness. The Sentinel modules are not designed to scare animals or birds, but rather to create and maintain an environment that is uncomfortable which can cause them to move on and avoid the area.

The ultrasonic repeller can be mounted in a safe spot on a wall or fence post etc, a few feet above the ground. Ideally, the repeller should be at approximately the same height where your particular target pest habits. For example, if you are trying to repel birds on a roof, or Pigeons in a tree, the unit should be higher off the ground. But often you will need to compromise and the modules are supplied with an adjustable mounting bracket. Once set up and pointing in the general direction, the module can be adjusted on its bracket and pointed to the effected area for best results. To avoid rain water from gathering in the speaker housing and causing possible damage, pointing the module upwards should always be avoided with vertical adjustment not exceeding 10 degrees above horizontal. If mounting in warehouse, remember that girders and pillars will block the sound, so it is better to have no obstructions directly in front of the unit.

        Sentinel 1 way ultrasonic cat bird pigeon fox badger repeller deterrent rear                           Sentinel 4 way ultrasonic cat bird pigeon fox badger repeller deterrent mounting bracket 2

Please pay attention to the fact that ultrasonic sounds travel in straight lines (similar to that of torch light). Therefore the module should be positioned in such a way that the loudspeaker points directly at the area to be protected. Obstacles (e.g. cupboards, shelves, fences, trees and hedges) cast “shadows”, the ultrasonic sound behind these obstacles is considerably weaker, so line of sight is always the best option. The frequency can be adjusted by using the controller on the base of the casing. To change the position of the controller use a small screwdriver and twist the protruding adjustment screw carefully.

Adjusting the frequency.

If the controller is turned anti clockwise, the sound frequency will get lower all the way down to approx. 8.000 Hz and audible for human beings. The more you turn the adjustment screw in a clockwise direction the higher the sound frequency and from a certain point on, no longer audible for human beings. Every species of animal reacts differently to specific frequencies and this will have to be tested accordingly for best results.

          Sentinel 4 way ultrasonic cat bird pigeon fox badger repeller deterrent control panel base2

Underside of the unit

For better results we recommend not to operate this ultrasonic device permanently but only to have it switched on during the hours that are of the most concern or to operate the device through a plugin timer set for the active periods.

The operating voltage of 12V d.c. voltage is supplied by the plug-in power supply and no other mains adaptor should be used. Every module has been tested carefully before dispatch, so if there are any concerns regarding installation or functionality please contact us for advice.

Sentinel 4 way ultrasonic cat bird pigeon fox badger repeller deterrent control panel base

The pest are not going away: Ultrasonic sounds do present a strong annoyance for animals but it can occur in some circumstances that ultrasonic sound won’t repel animals. This may happen for the following reasons:

  • 1) The animals have to take care of their young offspring close to the ultrasonic repeller and they will not leave them despite the annoyance.
  • 2) There is a shortage of food in the area and it can only be found close to the ultrasonic repeller
  • 3) Adaptation to ultrasonic sounds. Some electronic appliances do also release ultrasonic sounds from high voltage transformers etc and animals may get used to them.
  • 4) If wild animals have left their scent marks in the area, then these animals will want to defend their territory and ultrasonic sounds may not have an immediate effect on them. In this case please clean the area where the animals have left their scent marks.

Technical data:

Operating voltage: 12VDC

Current consumption: < approx. 60 mA Adjustable frequency: approx. 8…40 kHz (± 15 %) Frequency deviation, approx. 2 x per second: approx. 2…3 kHz (automatic change of frequency, siren-like) Sound pressure: max. 100 dB ± 15 % Range: > 50 m with free field of vision

Loudspeaker’s beam angle: max. 140 degrees.

Functional display: Power LED

Connection: via supplied plug-in adaptor (INDOOR USE ONLY)

Dimensions: approx. 72 x 50 x 31 mm (without mounting bracket)


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Hearing frequencies of Cats, Dogs and other animals

Hearing frequencies of various animals from around the planet. This can be useful information if you are checking if an Ultrasonic Animal Repeller will work successfully with your particular problem pest.


Approximate Range (Hz) 


dog 67-45,000
cat 45-64,000
cow 23-35,000
horse 55-33,500
sheep 100-30,000
rabbit 360-42,000
rat 200-76,000
mouse 1,000-91,000
gerbil 100-60,000
guinea pig 54-50,000
hedgehog 250-45,000
raccoon 100-40,000
ferret 16-44,000
chinchilla 90-22,800
bat 2,000-110,000
beluga whale 1,000-123,000
elephant 16-12,000
porpoise 75-150,000
goldfish 20-3,000
catfish 50-4,000
tuna 50-1,100
bullfrog 100-3,000
tree frog 50-4,000
canary 250-8,000
parakeet 200-8,500
cockatiel 250-8,000
owl 200-12,000
chicken 125-2,000

Ultrasonic Cat, Fox & Badger repeller with flashing LED strobe lights

Keeping unwanted Cats, Dogs, Foxes and Badgers out of your garden at night just got easier with the ultrasonic pest repeller / deterrent with twin flashing LED strobe lights. The battery or mains powered deterrent can be used in a loft, where there is no mains power supply, to get rid of squirrels. The animal deterrent uses ultrasonic sound to keep unwanted pests away from your property. It has a flashing strobe light that works especially well against nocturnal pests such as Foxes or Badgers and it is the bright, flashing LED strobe that will help get rid of Squirrels. The ultrasonic pest repeller has 2 different frequency settings, so play around and see which one works for you. Importantly, the repeller has an on/off switch so it doesn’t have to be on constantly (when you’re in the garden, for example).

The PIR sensor detects movement infront of the unit and activates the ultrasonic sound and the LED flashing lights.

  • Ultrasonic frequency range from 18000 to 24000 Hz
  • Battery: 1 x 9v (not included)
  • 240v mains adaptor fitted with a Euro plug (supplied with a UK adaptor)
  • Keeps unwelcome guests from your property
  • High quality weather durable
  • Covers 80 Sqm square garden
  • 2 x bright LED strobe lights for extra effectiveness
  • PIR activated for long battery life
  • Size: 12.6cm x 11.2cm x 11.2cm
  • Switches off automatically when the animal has left the area for extended battery life


For pricing & ordering, please visit the website.

User guide – Slim line Ultrasonic Mouse, Rat & Spider repeller from Pest Stop

The latest slimline & discrete Ultrasonic Mouse, Rat & Spider repeller from Pest-Stop protects large sized house (up to 4000 sq.ft). The advanced ultrasonic mouse & spider repeller has separate settings for mice, rats and crawling insects (spiders).

The Ultrasonic pest repeller uses fluctuating ultrasonic waves to cause auditory stress to pests which disrupt their normal behaviour patterns and make it uncomfortable for them to stay in the same room. Additionally, the unit sends electromagnetic pulses through your home wiring circuit that vermin find uncomfortable.

For more information and current prices CLICK HERE

Bed Bugs on aircraft – more common than you think

Flying is not for the faint hearted. You arrive hours before your flight to endure the rigours of enhanced security checks, grappling with hand luggage restrictions on liquids and electronic equipment. Now, the last thing you need, as you cruise at 35,000 feet, is to be bitten by bed bugs. But, it happens and with increasing frequency.

Bed bugs love to live close to their next human meal. They are great at hitching a lift in our luggage and pretty accustomed to international travel so, it’s hardly surprising that they are frequently found in aircraft seating. Not that any airline would like to admit it, but it happens! What can be done to control them?

This was the subject that Adam Juson from Surrey-based Merlin Environmental addressed in his presentation at the 8th International Conference on Urban Pests (ICUP), held in Zurich from 21-23 July.

Adam explained how bed bug infestations on aircraft are a growing concern and how they can have a substantial financial impact on commercial airlines. In the worst case scenario infestations have led to aircraft being grounded – and that costs mega bucks! And, he predicted, that things will get worse, before they get better, largely because most airlines currently have a reactive approach to the problem.

bed bugs on an aircraft seat

Research by Merlin Environmental shows that airlines with a proactive approach to bed bug management, fare much better. They suffer 80% fewer seats infested and almost 70% fewer insects in the most heavily infested seats.

The research was conducted over three years and covered more than 100 inspections of infested aircraft. A wide range of carriers, aircraft models and seat configurations were covered. Cases ranged from single insects, in single seats, to infestation of many thousands of insects, spread through multiple cabins. Detection and eradication methods were assessed. Having found a problem proactively, or by waiting for a customer complaint, which treatment method offers the quickest and best result?

Story from the Mail Online: Jumbo Jet being grounded following passenger with bites.

To assess the efficacy of the available methods, a combination of scent detection dogs and human inspection was used to document the infestation levels prior to, and then 28 days after, treatment. The methods assessed were methyl bromide fumigation by a specialist aircraft company, chemical applications of the two products approved for use in aircraft, Ficam W and K-Othrine and two forms of heat treatment – a closed system and a forced air system.

luggage at an airport

The results show that methyl bromide fumigation was the only treatment which achieved 100% control.

Both chemical treatments produced disappointing results. This is probably because the complex nature of aircraft seating and restrictions on dismantling them prevented the technician properly applying the pesticide. The elevated tolerance profile of field strain bed bugs to these chemicals would not have helped.

In addition, the aggressive nature of the cabin environment degrades both pesticides exceptionally quickly, resulting in negligible residual value to chemical treatments. Even with further approval of pesticides for cabin use, it is unlikely that a pesticide-based approach will achieve the levels of control needed.

Heat treatment being an environmental manipulation technique has many supporters in the aviation industry. The levels of control achieved were the closest to methyl bromide fumigation, although still not 100% effective. If carried out correctly heat treatment has no deleterious effects on the aircraft, however close attention needs to be paid to temperature monitoring. In one closed system, treatment overheating of the environment resulted in warping of plastic components in seating products and cabin side walls. Forced air treatment in particular shows great potential.

In conclusion, Adam said: “Early detection is vital particularly in view of the reduced efficacy of eradication systems. There is also plenty of scope for improved seating designs to reduce rates of establishment and spread. Research into passenger boarding behaviour with a view to reducing inoculation rates would also be helpful.

“With big differences in the approach between different airlines, some central resource which allows the aviation industry to share best practice would also be beneficial.”

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Life cycle of a house fly

The life cycle of a house fly begins in the egg stage. A female house fly is capable of laying up to 150 eggs in a batch. Over a period of a few days, she will produce five or six batches of eggs. Female house flies favour damp, dark surfaces such as compost, manure and other decomposing organic material for egg laying. House fly eggs resemble individual grains of rice.


Within a day, house fly eggs hatch into larvae, also known as maggots. Maggots are legless, white insects that feed from the egg-laying site for three to five days. During this time, maggots moult several times. They then choose a dark place to pupate.

Fly pupae are similar in function to butterfly cocoons: their hard, brown shells protect the inactive, developing flies. Over the course of three to six days, the pupae develop legs and wings, ultimately emerging as full-grown house flies. Within two to three days, female house flies are capable of reproduction.

house fly life cycle

Houseflies pass through four distinct stages: egg, larva, pupa and adult. The life expectancy of a housefly is generally 15 to 30 days and depends upon temperature and living conditions. Flies dwelling in warm homes and laboratories develop faster and live longer than their counterparts in the wild.

The housefly’s brief life cycle allows them to multiply quickly if left uncontrolled. Houseflies are known to carry over 100 diseases, including tuberculosis and cholera. They transmit diseases both by feeding and by carrying pathogens on their feet and mouths. Flies are fluid feeders and need to liquidise the food before they can eat it. To do this they produce quantities of saliva, this may be contaminated with disease causing agents, which have been regurgitated, from the salivary glands or the guts of the insects during the feeding process.



Electronic Fly Killers use an electrically charged high-voltage grid to kill the insects on contact. The dead insects fall into a catch tray suspended at the bottom of the machine. Sticky Fly Trap units, the insects land on the glue area of the board where they are held until they die. Boards should be changed at regular intervals and can be kept for insect identification or as record of ‘due diligence’.

CLICK HERE for a chart to identify different types of fly.

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Floods and problems with pests


Floodwaters often bring mass devastation, flooding homes and other premises, causing stress and deprivation. The presence of floods also frequently heightens the risk of disease.

floods 3

Floods can create the perfect environment for pests, such as rodents, since they are often displaced from sewers and burrows. The standing water, waste, sewage and debris left behind provide ideal breeding grounds for insects such as mosquitoes and other flies. Such favourable conditions can result in an abundance of disease carrying and nuisance causing flies, posing a significant risk to health.


Coliform bacteria and other faecal organisms can be associated with floods, stormdrains, sewer back-up incidents, etc. Weil’s disease or Leptospirosis, carried by rodents, has been associated with flooding. Some studies have found a 15-fold risk of the disease associated with walking through floodwaters. A recent report revealed that there were 42 cases of Weil’s disease
reported in England in 2010. Epidemics may be associated with changes in human behaviour, animal or sewage contamination of water, changes in animal reservoir density or following natural disasters such as floods. It is important to be aware of the flu-like symptoms caused by a Leptospirosis infection. Those who may be exposed to Leptospirosis should take relevant precautions listed on the ‘Leptospirosis (Weil’s disease)’ cards, which should be kept with you at all times.



Filth and debris left by the floodwaters create excellent breeding conditions for houseflies, mosquitoes, other flies and insects associated with decaying organic matter. Those insects may be capable of causing significant nuisance and in some cases spreading disease.

Control of such insects involves removal of the breeding source, which can be standing/stagnant water, and accumulations of organic matter in drainage systems. Flooded cellars in particular, can harbour Culex pipiens biotype molestus, a human-biting mosquito. Accumulations of decaying organic matter can provide breeding sites for a number of different ‘drain’ flies that may be involved in disease transmission and can certainly reach nuisance proportions. Such families of flies include the lesser dung flies family Sphaeroceridae, fruit flies family Drosophilidae, owl-midges or bathroom flies family Pyschodidae, fungus gnats family Mycetophilidae, sciarid flies family Sciaridae, window gnats family Anisopodidae and others. Sites that are very wet, for at least part of the year, may favour the development of biting midges, family Ceratopogonidae.

Sewer rats, or brown rats, are sneaking into houses in the UK to escape the flooding
Sewer rats, or brown rats, are sneaking into houses in the UK to escape the flooding


After flooding, many rodents are displaced from their natural habitat. The rodents will then find areas that provide food, water and harbourage. Inevitably, rodents enter houses, sheds, barns, and other buildings. Flood-damaged premises are particularly attractive and provide easy access for rodents. These unwelcome rodents may cause damage to property directly by gnawing or indirectly by depositing faeces and urine. Rodents can threaten public health, as they may carry diseases such as E.coli, Salmonella and leptospirosis. The high instance of recent flooding in the UK has increased concern regarding exposure of householders to these diseases and rodent control is likely to become increasingly important.


The Environment Agency recommends the following Safety Precautions:

Wear protective clothes, sturdy boots and waterproof gloves and face masks when handling debris

• Floodwater may be contaminated by sewage, chemicals, or rat’s urine (leading to Weil’s disease)

• Keep your hands away from your face while cleaning and always wash your hands if you come into direct contact with floodwater or silt

• Wash all cuts and grazes and cover with a waterproof plaster. Get a tetanus jab if you are not already inoculated

Contact the Environment Agency for further advice on cleaning up after a flood: 0845 988 1188.

Thanks to Killgerm Chemicals for the information.

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