Echo Plug and Go Motorcycle Handlebar Cell Phone/Device Holder and Charger (Black) Easily installed on any helmet and no sewing or special tools required Clamp adjusts for 7/8 inches to 1-1/4 inches handlebars and will fit most bikes Internal resistor for surge protection Cellphone, GPS or MP3 charger and bracket; iPhone, mini-USB charger tips and battery connector included Comes standard with 1 year manufacturer defect warranty on parts and workmanship