Goplus Folding Electric Bicycle Lightweight Portable Sport Bike Lithium Battery W/Two Speed Electronic Transmission System Easy Compact fold and an efficient ride when ridden on paved surfaces, perfect for city road. Allows for plenty of saddle height adjustment to suit the rider and is fitted with a quick-release clamp to assist in folding the bike quickly. Range per charge  16miles with pedal assist; Recharging Time: about 4 hours (at low battery). Made of Aluminum Alloy and very lightweightm,easy to carry and storage. Two speed electronic transmission system; Charger UL approved.