Wireless Doorbell, Support 433 Protocol, Visual Smart Doorbell Music Machine, 50 Music Wireless doorbell, support 433 protocol, visualized smart doorbell music machine, 50 music Product name: AC wireless doorbell Colour: Black Product Features: -High-precision electronic materials, combined with unique long-distance technology, under the same power consumption, the remote control distance of the wireless doorbell can be up to 1000 feet outdoors, becoming the industry's first. -Use high-quality speakers to make the doorbell output pure music with high decibels. -Using the industry's most stable music chip, loading 55 polyphonic melodies, making the doorbell ringing pleasant to the ears. -Patented unique product appearance. -Humanized 5-level volume adjustment to meet the needs of different environments and different sound levels. -Adopt digital double-panel circuit design, stable work, stable and reliable performance. -CE, FCC, ROHS, PSE, TELEC certification -Humanized design, including double-sided tape, mini screwdriver, 12V23A alkaline battery, no need to hire any professional, users can install the doorbell by themselves. -The remote control button with longevity design can be pressed 5 times a day on average and can be used continuously for 25 years. technical parameter: Wireless distance: (1000 feet) 300M in the open air Transmitter waterproof rating: IP55 Transmitter size: 3.2*2*7.3cm Receiver size: 8.2*8.2*5.5cm Scope of application: Apartment/Hotel/Hotel/Community