Home self-generated wireless doorbell Outdoor battery-free and wiring-free waterproof doorbell Easy to install without drilling Remote control distance 150M 60 bells Ambulance bell Nursing bell Elderly pager Wireless AC doorbell Plug-in wireless music doorbell. Self-generating waterproof doorbell. Power supply mode: transmitter self-generated, receiver plugged in Combination mode: One to one (1 transmitter + 1 receiver), one receiver can store up to five transmitter signals This doorbell does not require batteries, no wiring, plug and play, convenient and practical, easy to install Built-in 60 welcome music/4 adjustable volume levels (including mute) IP44 waterproof grade, can effectively prevent rain intrusion, sunproof and waterproof 150m remote control distance (open space) (this data is the barrier-free test distance of the open space in the experiment, the actual distance vary depending on the use environment and obstacles, please refer to the actual distance) The receiver is directly plugged in Receiver size: 95x54x50mm Transmitter size: 80x50x28mm Applicable scenarios: residential, hotel, villa, hospital Function: learning code Product parameters: Receiver: Working voltage:AC 100V-230V 50/60Hz Operating frequency:433.92MHz Standby power consumption:0.25W Music:38 Volume:4 levels (including mute) Controllable volume: equal 50dB/1m Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC 220V Colour:White Material:ABS Package Contents: 1 set * Self-powered remote doorbell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.