• 36-38 ringtones to choose from and 3-step volume control (0~85dB)
• Eye-catching backlight flashes when someone pushes the doorbell. Particularly suitable for the elderly, deaf, and pregnant women
• Uses machine-learning to prevent interference from other wireless transmitters
• Designed to last up to 25 years
• Working frequency: 433 MHz
• 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)
(A10 and A20 have the same function, only looks different, you can choose A10 or A20 wireless doorbell)
1 * Doorbell Receiver.
1 * Doorbell Transmitter.
1 * Strong double-sided adhesive.