This is the one I use.
http://www.amazon.com/HA-434RTL-Wireless-Driveway-Business-Security/dp/B003CWK4JK/ref=sr_1_3?ie=UTF8&qid=1464715985&sr=8-3&keywords=wireless+motion+alarm
Had it several years now and zero false alarms. I use a timer to turn the base off and on. It's only on from...