800 FT in open area range, with 58 ringtones and 4 levels volume to meet your needs for different occasions Comes with the receiver, will not interfere with other equipment in your home or those of your neighbors, ensures that you will never miss any visitors, even if you are several rooms away Preserves your last set melody after a power outage, no need to reset to your previous settings; convenient and easy to use design for a better user experience Simply get the bell plugged into the socket and Tear off the tape of the sensor and stick it on the door frame Featuring multiple chime options, handy volume control and long working distance, the wireless doorbell kit is a must-have accessory for home, office, store, etc Specifications: Material: ABS Model number: W-101 Working orange: 800Ft (250m) in open space (depends on different use environments) Melody: 58 chimes Volume: 4 levels Transmitter operating voltage: no battery needed Receiver operating voltage: AC220V 50HZ Transmitter standby power consumption: 0uA Receiver standby power consumption: ＜3W Transmitter transmit power: ＜10mW Transmitter transmit frequency: 433.92 Mhz Receiver transmit frequency: 433.92 Mhz Transmitter press key: 1 Receiver press key: volume key, music selection key and mode key Transmitter Size: 31 x 72 x 21.14mm Receiver Size: 60.1 x 60 x 68.7mm (EU plug) Transmitter weight: 26.9g Receiver weight: 68.3g Transmitter storage temperature/humidity: -20~60℃/≤85%RH Receiver storage temperature/humidity: -20~60℃/≤85%RH Receiver horn: 16Ω/0.25W Transmitter Waterproof Grade: IP44 Installation: The transmitter can be pasted with the double-sided tape that comes with the random delivery, or the holes can be fixed with screws. When disassembling and installing the transmitter, be careful not to touch the electronic components, and do not upside down. The receiver can be used when plugged into a regular indoor socket. Code operation: 1. Code matching Long press the mode key for about 3s and the doorbell rings (bird calls) to enter the code matching mode (exit the code matching state after 5s). At this time, press the transmitter host to ring (current music) twice and the code matching is successful. If the host does not ring, please repeat the above operation. 2. Code clearing Long press the mode key for about 10s, and the host rings (Ding Dong) and the code clearing is successful. Note: If you need to replace music, please re-match (hold receiver's music button, it will trigger clean pairing function).