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 lamp,when the switch turn on,the 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