[200M wireless range] The wireless doorbell has an ultra-wide coverage range, and its wireless signal has super strong penetration. It is not a problem to easily pass through doors or walls of materials. Not only that, it will never interfere with other wireless devices. You will not miss any visitors. [Waterproof and ]. The wireless doorbell has high waterproof performance and can withstand the worst weather conditions. With ultra-low power consumption and long-lasting durability, you can install this doorbell , in the classroom, indoors or outdoors. [38 ringtones and 4 volume levels] The wireless doorbell has 38 pleasant ringtones, and you can set different ringtones in different places. After power failure, the doorbell will automatically memorize the melody and volume level you last set. [Silent mode] The doorbell has a silent mode function. Keep your family away from interference during movie night, nap time, or any time you want privacy. [Iron door precautions] The doorbell button cannot be placed on the iron door, because the iron door has a strong signal interference ability, which will cause the doorbell to fail. Self-generating wireless doorbell No battery required Press to generate electricity Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC 220V Colour:White Material:plastic Package Contents: 1 x Self-generating wireless doorbell set 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.