【No Need to Pair】 This wireless doorbells for home has been paired before delivery. There is no need for wiring or electrician installation when using it since its installation can be completed within 1 minutes: plug the receiver into the socket, ready to go. Receiver working voltage: AC110-240V. 【32 Ringtones & 5 Volume Levels】The doorbell has been updated with 32 songs and 5 levels of volume that can be adjusted (maximum 120dB, minimum 0dB). The LED light of the receiver will blink when press outdoor push button, flashing LED light help people to notice even in mute mode. 【300 M/1000Ft Long Range】 This doorbell has strong anti-interference features and one-to-one signal pairing. No need to worry about signal connecting wrongly with the next door. And the sensing distance can reach up to 1000Ft (300m) in obstacle-free environment. You will never miss a visitor. Great for large homes, offices, apartments, and warehouses. Noted: If many doors or walls between the transmitter and receiver, it may reduce the range coverage. 【IP55 Waterproof & Energy-saving】The door bell is made of high-quality ABS material, showing high performance in fire and flame resistance. Working temperature:-20℃ to 60℃. IP55 dust proof and waterproof protection. The transmitter does not consume power without being pressed. Battery life:3 years. 【Easy to Install & Use】--Easily plug receiver into an electrical outlet. The push button can be easily fixed to the doorframe with the attached adhesive tape, or fit it with screws. Simply mount the doorbell anywhere you want.(NOTE:Do not install the transmitter on metal door because it is hard for signal to transmit.)