Features: Battery Powered PIR Alarm with Built in 130 Decibel Siren, operated by Remote Control (up to 50 metres away). This unique PIR Alarm can be used on its own as a Stand Alone Alarm System (protecting small buildings such as sheds, garages, holiday homes etc) or together with a range of additional Battery Powered Wireless Detectors & Sirens to increase the Security & Effectiveness (highly recommended). The built in 130 Decibel Siren will sound for 60 seconds when activated, but still remain fully armed (so will trigger again if the intruder is still present or re-enters the building.