SecurityMan SM80 Wireless PIR Motion Sensor for Air-Alarm1 and Air-AlarmII - White Add-on Wireless Motion Sensor For Securityman Air-alarm System Wireless Transmitting Distance: &gt;=450ft In Open Area Detecting Distance: 100deg , 10 X 10m Operating Power: 9v Alkaline Battery Battery Life Up To 2 Years Add-on wireless motion sensor for SecurityMan Air-Alarm system Operating power: 9V alkaline battery Wireless Transmitting distance: 450ft (in open area) Service life: up to 2 years Detecting area: 100 10x10m (33x33ft) Immune to pets up to 10 kg (22 lbs)