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.
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.
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.
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.
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)
8 thoughts on “Sentinel Ultrasonic Bird, Pigeon, Fox, Cat & Pest Repeller installation instructions and user guide”
Would this be suitable for a 4th floor balcony apt where pidgeons are resting and roosting on nearby balconies
Hi Teresa. Pigeons are notoriously difficult to move. If the unit has direct line of site to where the birds are sitting, it has a good chance of working. But if they are above or below your balcony, it definitely won’t work.
Thanks for that -, the pigeons at on balconies upper and lower than me to my right but they are in my direct line of vision – do you think it would still work ?
The sound travels in straight lines from the speakers. A little like a torch beam. It will only send sound in one direction. Point it up and the sound goes up. Point it down and the sound goes down. But it won’t do both at the same time.
If i mount it on a car
Wood it work on Cranes (birds) on a field?
I’ve not had to deal with Cranes before, but it might work provided the birds are within the range of the repeller.
Hi I have birds getting into my loft under my roofing. Would a unit in my loft stop this happe
Hi John, it might help drive them out, but ultrasonic sound doesn’t travel through the roof and so they won’t hear the noise until they are actually in your loft.