Feature:1. Easy Installation: This wireless doorbells for home has been paired. There is no need for wiring or electrician installation, you only need to plug the receiver into the socket, ready to go.2. Long Transmission Distance: Strong anti interference and one to one signal pairing. No worry about signal connecting wrongly. And the sensing distance can reach up to 918Ft in obstacle free environment.3. 38 Ringtones: There are 38 optional ringtones, and the built in speaker can emit rich, clear and stereo sound. There are 4 adjustable levels of volume.4. Energy Saving: The door bell is made of premium ABS material, high performance in fire and flame resistance. Adopts standby sleep mode, and the standby energy consumption is ultra low.5. Practical: Can be set a separate corresponding ringtone, can be used for home, villa, hotel, factory, can also be used as a pager for the elderly, sick, pregnant women emergency calls.Specification:Item Type: Wireless DoorbellMaterial: ABSFrequency: 433.92MHzRingtones: 38 songsButton: Touch buttonTransmission Distance: Approx. 280m/918ft ( maximum, obstacle free)Transmitter Battery: CR2032 or CR2025 button cell x 1 ( not equipped )Waterproof Rating: IP44Application: Can be used for families, villas, hotels, factories, for the elderly, patients, pregnant women emergency calls..Package List:1 xTransmitter2 x Receiver1 x Sticker1 x ManualNote:Please follow the operation voltage for power supply, the use of other voltages can easily cause fire and product damage!