Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Self-powered doorbell: measured distance of 100 meters, large volume, 4 levels of volume adjustable, 35 music, power off memory Say goodbye to the inaudible embarrassment: relatives and friends come to and cannot hear the knock, the courier knocks on the door, and the neighbor has something to do. A qualified self-powered doorbell: truly self-powered, long-lasting durability without battery ABS environmental protection material: materials and performance are strictly tested to longer service life of the doorbell Plug and play: the built-in kinetic energy generation module of the transmitter no longer has to worry about replacing the battery 4-level volume adjustment, bell with light: to meet the needs of different environments and different people Voltage stabilized smart IC: energy-saving and power-saving, long-term plug-in use Stable and reliable: using high-quality materials, stable connection, safe and reliable, small and compact appearance, and portable: the design is small and light, which does not occupy too much It has more space and is easy to put in daily backpacks, suitcases, etc., very suitable for travel and business trips. Product name: Self-powered doorbell colour:white material:ABS size:87x45x44mm Package Contents: 1 * Host Only the above package content, other products are not included. Note: Light 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.