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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25 thoughts on “customer review – Defenders STV610 ultrasonic cat repeller”

  1. I have over the last 3 years or so purchased about 6 of these things , and they work.
    However they have a finite life as driven rain penetrates eventually, also they are quite expensive to run as batteries have to be replaced which is a fiddly process and risks damaging the battery connections and the flimsy wires which connect the unit.
    I wish I could find out a source of plugs to provide an external power source. I have a large power supply which could easily run 10 of these cat scarers but I don’t know where or what type of power plug to order. CAN ANYONE HELP HERE PLEASE?.
    We have a garden which is subdivided, so we need approx 4 of these units running at any one time to keep the cats away.

  2. I have bought 2 of these units in recent years and found they only last about 3 years each. I opened the second one today and discovered that the smaller printed circuit board is corroded. I also found a spider’s web inside which indicates these units are not fully sealed and therefore subject to moisture (and spider) ingress. Otherwise they seem to provide some deterrent to cats but are not 100% effective.

    1. Hi Mr. Barry. Considering the severe weather we have all endured in the last 3 winters, its not unreasonable to expect some ingress of water. The manufactures do state that the cat repellers should be brought inside during extreme wet weather or in sub-zero temperatures.

  3. i have lost the battery cover will you send details of how i can buy one from you please thank you

      1. no as the batteries were dead,probably for some time ,it is about 2 years old, no older
        the only sound I ever heard was a high pitch when test button was activated

      2. Hi Dave, it does sound like the cat repeller is broken / faulty.It could be that water has got in and the internal circuits are damp or wet. There is nothing repairable, but try leaving it in an airing cupboard over the weekend. You never know it might just sort itself out. It not, I’m afraid its at the end of its life.

    1. left batteries in and turned off,brought inside in the warm for a couple of hours near a bit of heat,tried it again all working ok thanks for help

  4. I find that these units NEVER last a full winter, always need to replace in the spring and we have tried to put them in the more sheltered areas of the garden. It’s a shame they aren’t made more weather proof as then you would have a really good product as opposed to an ok one. They do work, but don’t last!

  5. Seagulls have damaged the sensor screen. Also when testing we get a high pitchsound which seems ok but when activated normally it emits low frequency pulses.

  6. The unit I have is only a few months old . It has just started making the same noise as when you first turn it on but does it every couple of minutes !

  7. My unit doesn’t have a test button…its the STV610.
    initially when I installed and switched on it had an intermittent ticking sound but after a while it started emitting an audible sound every 35 seconds which is a bit annoying.
    Is this a fault or due to location.
    The audible noise comes on despite there being no movement in the garden.

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