DSC Wireless 1-Way Vanishing Door/Window Contact - Wafer Thin Profile (Not suitable on metal doors or metal window frames)Industry leading PowerG wireless technology Connect siren, strobe and 4 PGMs for a full range of applications Enhanced security is enabled by the double end of line programming, tamper protection (including back tamper) and the integrated power supply supervision 2 Auxiliary independent power circuits 24 hour back up battery is safely stored inside the plastic cabinet Use your favorite hardwired device from any hardwired portfolio and incorporate it