Why the motion sensor? The Cat 40 comes complete with an infra-red (PIR) motion sensor which turns the device on when a warm body enters the controlled area. This has an important purpose other than saving battery life: researchers have found that cats can become desensitized to the noise if they realise that random sounds are not associated directly with their presence in the controlled area. With the motion sensor, the cat learns to associate the noise with its own movement, and is much less likely to stop being afraid of the noise.
Requires two 9V batteries (the rectangular ones used in smoke alarms)Battery life depends on how many times the device is activated, but they typically last 3-4 months assuming 10 activations per day. Batteries not included.
What area does it cover?
It covers a 98 degree arc, to a distance of up to 40ft (12m), giving a total unobstructed working area of 1200sq ft (120sq m).
How quickly will it work?
If the cats have a habit of feeding and fouling in your garden, it can take 14-28 days to deliver the full deterrent effect. 'Occasional' visitors will usually be stopped within 7 days. If you have a dog, it may affect the dog if it's allowed in the same part of the garden. The sound doesn't travel well through walls and fences, so it won't affect a dog in the house, or a neighbour's dog.