The SM-82 is an add-on wireless doorbell button which is fully compatible with Air-Alarm II series alarm system. It supports long transmit range. It is inexpensive and easy to install.
- Operating power: internal rechargeable Li-Ion battery (3.7v/200mAh)
- Wireless transmitting distance: up to 300 ft. (in open area)
- Service life: up to 3 years
- ON/OFF switch built-in
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