Check the listing for details. DSC WLS912LNB WIRELESS GLASS BREAK DETECTOR FOR IMPASSA ALEXOR POWERSERIES. Color: White, Condition: Used. Listed at 15.00 USD. The DSC WLS912LNB Wireless Glass Break Detector is designed specifically for the Impassa Alexor Powerseries system. This white detector uses wireless connectivity to alert you whenever it detects a glass break or vibration in your home. With its reliable brand reputation and advanced technology, this DSC model provides added security and peace of mind to your smart home surveillance system. Batteries not included. Please note that- the tab on the base has been broken. The sensor unit works, but you either need another base, or you will need to use a screw driver to remove the sensor from the base. The two are apart when shipped, so you can immediately attach the sensor. If you are replacing a broken unit, just leave your base in place, and use only the new sensor unit.