Ultrasonic cat repellers – size matters?

The question to ask is: “do I need a large ultrasonic cat repeller or will a smaller (and less expensive) model get the same results ?”.

All our ultrasonic cat deterrents work very well, but it’s a case of picking the right machine for the size of your garden and the severity of the problem.

If you have a small garden, our best selling, smaller cat deterrent STV610 (£26.99) with a 30ft range, will more than likely do the job. However, if you have a larger garden, or a large number of cats that use your garden as a toilet or dig up your flowerbeds, you might want to consider the benefits of the bigger, 150ft range Sentinel ultrasonic cat deterrent (£129.99). Or even our latest model, the ultra-powerful Sentinel 3 way that has a three way speaker system and a maximum range of 300ft (£169.99).

 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

If you are considering splashing out on the Sentinel, one of our more expensive and powerful ultrasonic cat repellers, check the differences before you spend your hard earned cash.

30ft range
30ft range

The first and obvious difference is the effective range: 30ft for the STV610 cat deterrent compared with 150ft for the Sentinel. It’s not only the range in a straight line that is increased, but with the longer range, you also get a wider spread of ultrasonic sound from the 150ft model.

ultrasonic cat repeller operating ranges

The huge benefit that comes with the bigger Sentinel cat repeller is the adjustable ultrasonic frequency. The main reason this ultrasonic repeller stands head and shoulders above other models is because the frequency is adjustable. The user can very easily fine-tune the ultrasound to get the optimum effect for the creature you are trying to repel. The frequency can be adjusted to also repel rats, mice, squirrels, foxes, birds etc.

As the Sentinel ultrasonic cat repeller is so powerful, it is mains powered and therefore always working, giving protection 24/7. It comes complete with a mains adaptor & 10mtr of cable.


We now have an even more powerful model with a range of  300ft. The Sentinel 3 way ultrasonic cat deterrent.

Sentinel 3 way ultrasonic cat dterrent
Sentinel 3 way ultrasonic cat deterrent
sentinel deterrent operating range
sentinel deterrent operating range

More details and prices on all ultrasonic cat repellers can be found here:

Beat Pest Control

customer review – Defenders STV610 ultrasonic cat repeller

Below is an independent review of the STV610 ultrasonic cat repeller (£24.99free UK delivery). I came across it by chance and thought that as someone, somewhere out there had taken the time and effort to produce such a detailed review, I would reproduce it here in our blog.

**VOUCHER CODE** If you purchase the STV610 from our website, you get 10% discount. Use the voucher code “BLOG” at the checkout.

Customer summary:

I’m happy with the results from the STV Defenders ultrasonic cat repeller installed two years ago. The repeller hasn’t completely eliminated the problem, but it is a significant improvement when compared to the years before I had the repeller. I’m hoping the second ultrasonic repeller, which has just been installed, will be just as effective.

Full review:

All I will say is we have had problems with local cats fouling our lawn, and had tried a variety of remedies with varied degrees of success and expense. As a last resort, I purchased this inexpensive ultrasonic cat repeller in 2010, after learning a friend had success with a similar but much more expensive product. I also purchased the mains adaptor as I didn’t wish to spend a fortune on 9 volt alkaline batteries, or worry about them going flat.

I recently had to purchase another unit to stop cats fouling another part of my property. These are photos of the newer unit, though to be honest, the packaging and product looks very much identical to the one I purchased two years ago.

The Mega-sonic cat repeller was also previously known as the “Big Cheese” Ultrasonic Cat Repeller. Like other similar products, it works by detecting any change in heat signature within its vision of detection, and then emitting an ultrasound which apparently irritates or annoys cats (very young children and teenagers can also hear it apparently). Suffice to say, this product may not work with all cats, especially deaf ones !

stv610 inc mains

The PIR (heat) sensor, loudspeaker, LED and ‘test’ button are on the front. A stake can be attached to the unit for fixing into soft ground, or it can be hung on a wall (though the 1 inch screw they supply is far too short). Just like any other type of PIR sensor, it works by detecting significant ‘changes’ in infra-red heat signature within is detection range, which is likely to be caused by movement. When the unit is triggered, the red LED lights up for about 25 seconds in which time it is also emitting the ultrasonic sound.

One important point worth noting, is if there is no further change in the infra-red signature, the repeller will not be set off again. For example, if a cat wonders into the detection range and triggers the repeller. If the cat stays put and puts up with the noise, the repeller will switch off after 25 seconds. Only if the cat decides to ‘move’ again, is it likely to trigger the repeller and cause it to sound for another 25 seconds.

stv610 inc mains front close           stv610 inc mains rear close up

The test button on the earlier repeller had a tendency to stay jammed-in when depressed. As a consequence, the unit would not stop emitting an audible sound from its speaker. Pulling the green button out and refitting it was necessary. It’s too early to tell, but the button on my newer unit doesn’t seem as tight-fitting in its round hole, so hopefully is less likely to ‘jam’ when depressed. The red LED can be quite difficult to see if you are testing the unit from a distance.

The master on/off switch and socket for external mains adapter can be seen here.

stv610 inc mains base close          stv610 inc mains base open

The new mains adapter is different to the one I purchased in two years ago. The earlier model was a ‘transformer’ type mains adapter. This newer one which I think was introduced from October 2011, is similar to the type supplied with mobile phones and other gadgets nowadays. It is supplied with a 5m extension lead.

stv610 inc mains adaptor

Location, location, location and persistence

I position my cat repellers to guard our bare lawns only. One thing I have discovered is to ensure that walls and other nearby objects do not fall within the vision of detection, otherwise, it will desensitize the repeller when the weather is hot. The closer the object is to the repeller, the more it may be desensitised. What happens is the repeller may fail to distinguish a nearby brick wall which has been baked by the sun, to a cat wondering across the lawn further away.

If you have had persistent problems with cats fouling your lawn, you also need to properly clean up the area. This may involve hosing down the area after removing the new cat mess. I personally mix a bit of Jeyes fluid in an old watering can full of water, and use that ‘clean’ up an area after removing the cat mess. If you fail to clean up the area properly, the cats will just keep on returning.

Cats are also very smart. They may find blind spots in the repeller’s field of detection. You may need to move the repeller or install more than one unit. I’m happy with the results from the repeller installed two years ago. The repeller hasn’t completely eliminated the problem, but it is a significant improvement when compared to the years before I had the repeller. I’m hoping the second repeller which has just been installed will be just as effective.

The STV610 ultrasonic cat repeller can be purchased from Best Pest Control

**VOUCHER CODE** If you purchase the STV610 from our website, you get 10% discount. Use the voucher code “BLOG” at the checkout.

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