Smart Home Wireles Doorbell Buzzer-Beaters Waterproof Function of Remote Control

Features and specifications
Eye-catching backlight flashes when someone pushes the doorbell. Particularly suitable for the elderly, deaf, and pregnant women
If paired with multiple push units in one system, the chime can be set individually for each push unit
Uses machine-learning to prevent interference from other wireless transmitters
Automatically saves selected ringtone after powering off
Working frequency; 433MHz
Receiving distance : 300m (in open area)
Transmitter size : 75 x 51 x 20 mm Receiver size : 95 x 65 x 24 mm
Receivers Rated voltage : AC 110V-220V-240V
The transmitter 12V23A battery factory pre-installed (battery not included)