IP68 immersion waterproof rating The doorbell will not fail even on , no need to worry about rain Press to generate electricity No battery required Only 2 kWh of electricity per year, reducing maintenance costs of battery replacement 38 chords to switch freely Pleasant ringtones The transmitter is easy to press The transmitter has been tested for 20W presses The elderly and children can easily press the transmitter One-touch mute your family's rest Silent mode, with flashing lights to remind you, will not affect your baby/elderly's rest Plug Type: EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC220V Colour:Black Material:ABS Package Contents: 1x transmitter 1x receiver 1x double-sided tape 2x Screw 1x Instructions in Chinese and English 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.