The SM-89 is an add-on wireless panic button which is fully compatible with Air-Alarm II series alarm system. It supports long transmit range, user friendly, and Do-It-Yourself installation. And, it is inexpensive.
- Operating power: 23 Amp 12 Volt alkaline battery
- Wireless transmitting distance: 450 ft. (in open area)
- Light indicator
- Service life less than 2 years
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