Serene CentralAlert Accessory - CADXH Wireless Door Knock Sensor Transmitter
$60.00
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Hang it on your doorknob to detect the knocking on your door. The CADXH sensor sends a wireless signal to trigger the CA360 to alert you that someone is at the door. Ideal for both home and hotel stay applications. Features: Detect vibrations from knocks on the door. 2.4GHz operating frequency Up to 210 ft operating range Uses 2 AA alkaline batteries (not included) Battery Life: Up to 10 months Dimensions: 2.5" x 3.8" x 1" Net Weight: 4 Oz
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$55
$60
(+$5)