| Descriptions: When someone rings the doorbell, the bright backlight flashes. Especially suitable for the elderly, deaf and pregnant women, using machine learning to prevent interference from other wireless transmitters. Designed for 25 years. The AC doorbell and receiver (indoor unit) use the domestic power supply and can be directly plugged into the socket, without battery, environmental protection and convenience! Transmitter (outdoor unit) uses battery for about one year. Super reception is suitable for home, office, hotel, building, dormitory, factory, construction site, etc. Use the same doorbell in one range, and they will not interfere with each other! The wireless high-frequency | |