Special attention: if the switch you received is broken or the LED light is not on, please send us an email in time, and we will solve your problems for you. Mount hole diameter: 22mm/7/8″Handlebar,Suitable for 12V battery installation motorcycles,electromobile,ATV,scooter. Easy assembly,It comes with three connecting wires: brown, black and blue.Blue(positive).Brown(negative).Black(connect to the equipment,positive) Total size:37x 58mm/1.4″ x2.2″(w*h), connecting line length: 50cm/19.6″, case material: aluminum-alloy. Product name:Motorcycle Headlight ON/OFF Control Switch, Feature:switch has the blue pilot lamp,when the switch turn on,the pilot lamp will be lighting,the light goes out when turned off.Package content: 1x Motorcycle Headlight Control Switch. Product description This Motorcycle light switch will fit on all motorcycles, electromobile, ATVS, scooters and snowmobiles, fit 22mm/7/8″ handlebar, could be used on DC 12V electrical system