Item description for Serene Innovations CentralAlert CA-DXH Hanging Door Knock Sensor

The Door Knock Sensor with Door Hanger is part of the CentralAlert Notification System by Serene Innovations. It sends to the CentralAlert receiver to notify you when someone is knocking on the door. The CA-DX Door Knock Sensor is ideal for bedrooms or hotel rooms and is safe and secure since there is no part visible outside the door.

Features:

2.4GHz operating frequency
Up to 210 ft operating range
Uses 2 AA alkaline batteries (not included)
Dimensions: 2.5" x 3.8" x 1"

Feature	Details
Brand	Serene Innovations
Mfg part #	CA-2010-DXH-A
Warranty	One year limited warranty
Color	White
Weight (lbs)	0.2
Battery operated?	Yes (batteries required)
Batteries included?	No
Battery details	(1) AA Alkaline
Country of Manufacture	China
System	Serene CentralAlert
Alert Type(s) Vibration Flashing Light Loud Audible Low Vision / Deaf-Blind	No No No No
Transmitter / Receiver	Transmitter
Alert Trigger(s) Baby Cry Carbon Monoxide Mobile / Smartphone Doorbell / door knock Motion Pager / SOS Phone / VP Smoke / Fire Sound Severe Weather	No No No No No No No Yes No No
Range (ft)	200
Expandable	Yes
Portable	No
Battery backup	Yes
USB charger	No