Are you looking for a professional, yet affordable music doorbell? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further Our professional music doorbell must meet you needs. It is one of the best choices for you. Features - Color: Black. - Size: 8.1 x 8.1 x 2.5 cm. - Material: Plastic. - Learning code: Users can flexibly increase or decrease the receiver and transmitter according to their needs. The pairing method is simple and easy to operate. - Working principle: when a person presses the transmitter outside the door, the current is converted into wireless signal which is transmitted to the receiver, converted into current for ringing and flashing to remind the outsider. - Transmitter waterproof rating IP55: built-in waterproof rubber ring, can work normally in rainy days, don't miss any visitors. - Level 5 volume adjustable: 0-110 decibels, unique mute-free mode, giving users a better home experience. - Use scenarios: suitable for home, office, hotel, building, dormitory, factory, construction site, villa or any space that needs such service. Specification - Ringtone: 55 Melodies (Optional) - Wireless Distance: 300M in Open air - Sound Volum: 5 Levels, 0-110dB - Transmitter Waterproof Level: IP55 - Working Frequency: 433.92MHz plusmn;280KHz - Working Temperature: -30~+70