Features: Features a 500W powerful motor with 5 power assist level , boasting top speed of 21.7 MPH. Built in 48V / 10AH large capacity battery offers strong climbing and acceleration capabilities, with a travel range from 17.4 miles(pure power mode) to 23.6 miles (pedal assistant). 3 work modes: pure electric mode, electric power+pedal mode, manpower mode. 7-Speed gears help you conquer a variety of terrain. Height adjustable for adults and teens. Easily adjust the bicycle seat to find the perfect position for a comfortable ride. 20x4 inches fat Tyre, super grip, anti skid, explosion proof, provide you with the best riding experience. Front and rear double disc brake, providing powerful, progressive braking in any conditions. Collapsible for space-saving storage and convenient transport. Aluminum alloy frame strong enough to bear a person up to 330.7 lb. 300 lumens super bright front light for safe riding in dark. Nice tool for urban, commuting, short trip, shopping and daily use.