Hanging Doorknob Knocking Alert - CentralAlert™
Hanging Doorknob Knocking Alert - CentralAlert™
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A portable door sensor solution with many uses
You can easily hang it on your doorknob to detect someone knocking. The sensor transmits a wireless signal that triggers the CentralAlert System to notify you when someone is at the door. Ideal for interior and exterior doors at home as well as hotel doors.
Specifications:
Wireless technology................................2.4GHz Smart code
Operating range......................................Up to 300ft.
Battery type............................................2 AA size alkaline batteries
Battery life..............................................Up to 10 months
Operating temperature..............................+10 to 40 degree C
Size.........................................................2.5" x3.8" x 1" (64x96x23mm)