If you want something to alert you when a cat/fox is in your garden you might want to consider one of these:
http://www.easyalarms.co.uk/alarm_systems-wireless_plugin_alarm.asp
http://www.amazon.co.uk/wireless-pl...ZDX2/ref=sr_1_2?ie=UTF8&qid=1334218805&sr=8-2
I've had it for a few weeks and it seems to work okay. It makes a doorbell sound when it detects a heat source moving in my garden and I can go outside and scare the cat off. The range isn't fantastic, you have to put the alarm near the back door and put the sensor somewhere it has a pretty straight view of the back door. It's also not officially outdoor but I've put some duct tape over the joins in the plastic so it should be pretty outdoor safe now.
http://www.easyalarms.co.uk/alarm_systems-wireless_plugin_alarm.asp
http://www.amazon.co.uk/wireless-pl...ZDX2/ref=sr_1_2?ie=UTF8&qid=1334218805&sr=8-2
I've had it for a few weeks and it seems to work okay. It makes a doorbell sound when it detects a heat source moving in my garden and I can go outside and scare the cat off. The range isn't fantastic, you have to put the alarm near the back door and put the sensor somewhere it has a pretty straight view of the back door. It's also not officially outdoor but I've put some duct tape over the joins in the plastic so it should be pretty outdoor safe now.