bout this item Mounting hole size:12mm, 4 Copper Pin Switch. Red LED Light. Operation type Momentary: Pressing the button ON, Release the button OFF. Switch rating:2A/36VDC, LED can be ON all the time or only ON when switch is ON, depending on how you wire it. Switch LED max voltage: 12V (when the voltage is higher than 3V, you need to add external resistor.) 12mm Red LED Light 2A Momentary Push ON/OFF Button Switch Stainless Waterproof