Catalog > Consumer Electronics > Security & Alarms > Alarms > Alert Systems Onyyx Wireless Door Sensor Wireless Door Sensor ONYYX DOOR SENSOR ONYYX WIRELESS DOOR SENSOR, 500m LINE OF SIGHT RANGE (868MHz) Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Sends an open and close signal 2 year battery life External connector for 3rd party devices 500m Line of sight range Two-way wireless transmission (868Mhz)