Upgrade your home with the M557 Waterproof Wireless Doorbell Chime, designed with cutting-edge technology for unmatched reliability and performance. This versatile doorbell offers 32 melodious tunes to personalize your entry alert and features a long-lasting battery supporting up to 30 transmitters without power loss. Enjoy customizable volume control for the perfect sound level in any environment. Its waterproof design and vibrant backlight upon pressing ensure durability and visibility, making it perfect for families, businesses, the elderly, pregnant women, and individuals with hearing impairments. Effortlessly installable with EU, US, and plug configurations, it eliminates the hassle of wiring, providing a seamless setup experience. The M557 Doorbell is your go-to solution for a convenient, reliable home entry system.

 Technical Parameter：
Receiver Working Voltage: AC 100-220V
Working Current: <100mA
Wireless Frequency: 433MHz
Working Temperature: -10 ° C -50 ° C
Wireless Distance: 150 meters (open space)
Button's Battery: 1pcs 23A 12V battery or CR2032 battery