   Availability: Usually ships in 1 to 2 business days. Price: $20.99
OverviewMake your AirAlarmII Security System more useful by adding additional Wireless Door/Window Sensors. Your system came with one sensor, but you can add as many as you want (up to the 60 sensor maximum). Add one to each entry point - sliding doors, windows, back door. Operates up to 2 years on one type 23A or 27A battery (included). Features
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