Look this high sensitivity alarm detector, you will get what you want! Dual beam infrared variable frequency bijection alarm detector system with LED voltage display. This IR Wireless Detector is ideal for observing visitors to offices, homes, shop, clinics and so on. IR Wireless Detector adopts self-designed DSP chip with patented frequency adjustment calculation technology. Infrared Alarm Detector works as an anti strong light detector and decreases misinformation. It can effectively recognize weight and size of intruder, so it prevents misinformation when pet interferes. Good at auto temperature adjustment. Have excellent detecting functions.The best alarm detector is a best choice for you. So what are you still waiting for?
Other Thoughts:I bought 2 other ones like this and both set off false alarms,I was ready to hard wire one then I looked up this 1 so I gave it a try I am very pleased with this purchase I will be purchasing here again!