Customize your Alertmaster desktop alerting system with the Door Knocker Transmitter. You can add this wireless unit within 24 metres (80 feet) of:
The Door Knocker Transmitter alerts you when someone knocks at your door. It includes a battery and needs no wiring or plugging in.
Details and Specifications
What's in the box?
- AL10-KNOCK transmitter
- 9-volt alkaline battery
- User manual
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