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• 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)
• Receivers Rated voltage: AC 110V-220V -240V
• The transmitter 12V23A battery factory pre-installed (battery not included)