This wireless outdoor motion sensor works with a transceiver to send signals to lamp, appliance or other modules. If the system is armed and someone approaches your home, the outdoor, battery operated motion detector sends a wireless signal to Transceiver that triggers a signal which can turn on lights and appliances or be set to start an ActiveHome macro, or other security devices. Weather resistant, great for outdoors. Can also be used to turn on lights at dusk and off at dawn.
PIR Sensor
Use with a wireless transceiver. 
4 AA batteries required 
Manufacturer: X10 Wireless Technology, Inc
Manufacturer warranty: 1 year 
Product questions: 800-824-3005