The On/Off Switch is a spare part with the light kit, as the controller have power consumption when it is not use, it will drain about 7 mA current, so an on/off switch is very important to disconnect power when the bike was kept for long term storage. Push Button Switch with waterproof rubber boot.Ideal for any 6-14 volt DC application requiring a waterproof on-off push button switch.Works great for LED Accent Lighting on Motorcycles, Cars, Trucks, ATVs, Golf Carts, etc. Included : 1pc 12V Waterproof Push-Button On-Off Switch with 3M taple on pack,one quick connector Features: – Waterproof Push Button boot – Single pole switch – Easily mounts using 3M double sided tape (included) Rectangular base measures .1.96inch*0.98inch*0.78inch – Rubber boot unscrews for flush mounting On/Off Switch Guide 1. The On/Off Switch include a 3M tape to stick the switch on where you want to install it. 2. There is a quick connector include for easy connection Find the red power wire on the controller take away the battery ring from the wire and use the quick connector to connect the power wire of the controller with the wire of the On/Off switch please see the guild as below: