Feature:
No wiring, easy installation. 32 ringtones optional. Transmitter (button): 23A 12V, (including small battery). Receiver: AC, DC. Just plug in the AC. DC (2 AA batteries) needs to be prepared by the buyer. The light of the incoming bell flashes to remind the hearing-impaired elderly and the hearing-impaired that the doorbell is ringing. Transmitter installation (key): A small 12V23A battery is delivered. To install the battery, use a flat-blade screwdriver to pry off the back cover.
Comes with double-sided adhesive, can be directly attached to the anti-theft door.
The rear cover has screw holes reserved for fixing on the wall.
Specification: Input voltage: DC 3V Bells: 2 x 1.5V AA battery(not included) Bell battery: 12V 23A alkaline battery (not included) Doorbell Type: Wireless DIY supplies: Electric Model: 308D Doorbell size: 95*60mm / 3.74*2.36" Remote control size: 72*38mm / 2.83*1.5" Color: White + Blue Material: Plastic Note: Due to the different monitor and light effects, the actual color of the item might be slightly different from the color showed in the pictures. Thank you! Please allow up to 1-inch differences measuring deviation due to manual measurement.  1 X Transmitter
1 X Receiver            
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