There are several functions essential to the proper operation and safety of you GY6/139QMB powered scooter located on your left handlebar This includes horn, lights and turn signalsDescription There are several functions essential to the proper operation and safety of you GY6/139QMB powered scooter located on your left handlebar. This includes horn, lights and turn signals.Replace those worn buttons and controls in one fell swoop with the complete left hand control switch with lever for GY6/QMB139 scooters. This complete assembly makes replacing all those little buttons and wires fast and easy. ? WARNING California Residents: Proposition 65 Warning