Securityman 3 pack of Add-on Wireless Door/Window Sensor (for Air-Alarm series) - Compatible with Air-Alarm1 and Air-AlarmII series. IMPORTANT NOTE: Under Air-AlarmII series SM-87B will function as a normal door/window sensor without the Smart Arm and Zone Alert featured in the SM-87L door/window sensor. For Air-Alarm1 and Air-Alarm-DL user if SM-87B are not available please replace with our SM-87L model.
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