Specification:_x000D_ Contact:sterling silver _x000D_ Head: Flat Head_x000D_ Material: Aluminium Oxide_x000D_ Color: Black_x000D_ LED color: White Yellow Red Green Blue _x000D_ Switch Rating: 3A /250VAC _x000D_ Waterproof Grade: IP65 _x000D_ LED Voltage: 3-6V,12V,24V,220V _x000D_ Operation Type: Momentary and Latching _x000D_ Hole size: 12/16/19/22mm_x000D_ _x000D_ Voltage Selection_x000D_ 3V-6V :3V 5V 6V _x000D_ 12V-24V: 12V 24V _x000D_ 220V: 220V 230V _x000D_ _x000D_ Pin Terminal Introduction_x000D_ "+": positive pole of the led_x000D_ " - ": negative pole of the led_x000D_ " NC ": Normal Close_x000D_ " NO ": Normal Open_x000D_ " C " : Common_x000D_ Connect " NO " and " C " : The circuit is alway open unless press the button._x000D_ Connect " NC " and " C " : The circuit is alway close unless press the button._x000D_ _x000D_ Operation Type _x000D_ Momentary :After pressing the button ,press-key will return automatically If you don't continue to press the buttonSelf-reset. (like Computer button)_x000D_ Latching Fixing: After pressing the button ,press-key stay in a position until it is pressed again, then it return. (like lamp switch)_x000D_ _x000D_ Note:_x000D_ 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need._x000D_ 2.Please allow 0.5-1 inch difference due to manual measurement.(1inch=2.54cm)_x000D_ 3.There Are No Instructions Included In This Kit.Professional Installation Is Highly Recommended!_x000D_ _x000D_ Package Includes:_x000D_ 1 x LED Button Switch