The self-locking push button switch is made of aluminum, which is durable. The button is black and round, and the Led voltage is 12V only, Hole size required is approx.19mm / 0.74 inch. Button switch: Push it, on; push the button again, off. Easy to install and IP67 waterproof, it can be used in wet or dusty enviroment. For the self-locking button switch with blue LED light, the LED light can be on all the time or only when the switch is turned on, depending on how you wire it. Size Chart: Size: approx. 60x50x20mm / 2.36x1.97x0.79 inch Package Includes: 1 Piece Latching Push Button Switch Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!