SecurityMan SM89 Wireless Panic Button for Air-Alarm1 and Air-AlarmII - White Add-on wireless remote controller for SecurityMan Air-Alarm system Wireless Transmitting Distance: 300ft (in open area) Operating power: 27A 12V alkaline batteryBattery service life:  2 years Battery service life:  2 years Control buttons include Arm, Disarm, Home Alarm(when in home), and Panic Button