Usage Tips:[Soft green lighted wall button]-The shell is made of black plastic, with a white center strip appearance. It can be turned on/off with a single tap, and it lights up in soft green. Whether it is white or green, it is easy to find in the dark, which provides convenience for opening and closing the garage. [Compatibility]-This wall-mounted garage door bell door opener is a good substitute for your garage door opener switch and is compatible with Liftmaster 75LM remote control. [Easy Installation]-First, separate the two wires of the garage door, connect the two wires to the terminals of the internal circuit board, and then install the button switch to the wall with screws. After finishing, press the button to display a soft green light. Note: there are no wires included with the push button size: 7.2 x 1.8 x 1.8cm Material:plastic colour:Black Package Contents: 4 x Wired garage door opener buttons 8 x Screws / 2 x Wired garage door opener buttons 4 x Screws 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.