[Power saving]: The upgraded LED light doorbell button is more beautiful and power saving than other doorbell switches; It's easy to find green light in the dark [Widely used]: This kind of luminous doorbell button switch is almost universal, suitable for low-voltage buzzer system, and is a good substitute for the old garage door opener or doorbell switch [ material]: It is made of solid door bell cover, which is not easy to break and deform. The interior is made of high-quality copper plate. This wall mounted door opener must be to be used for a long time without needing to be replaced again [Easy to install]: This wall mounted doorbell button is about 2.8 x 0.86 x 0.59 inches (L x W x H), equipped with 2 screws, and the screw hole spacing is 2.2 inches (note: wires are not included). If it is used as a substitute, it may not need to drill holes [Widely used]: This kind of luminous doorbell button switch is almost universal, suitable for low-voltage buzzer system, and is a good substitute for the old garage door opener or doorbell switch Colour:black Material:plastic Package Contents: 3 x 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.