Come with pedal assist and walk-assist model. Outage braking system and Mechanical braking system, work along both lines, provide security for your trip. Please pay attention to the size and weight of the bike in case it is too big or heavy for you to ride. (Total weight:74.63 lb). Strong 500-Watt brushless rear motor, provide powerful power to a bicycle, allowing it to reach speeds of up to 23 MPH. Battery:The removable 36V Lithium Cell with smart lithium battery charger. 26 X 4.0 Fat Tire in All Road Fat Tire-Durable All Condition Road--More than Safe, Balance, Fast and Stable for Your Cycling.36V/13AH Removable Lithium Battery, 305 x 85 x 120 ABS plastic cell box. Battery lock and power lock function. Ergonomic Design:90% Pre-assembled. We pay great attention to every detail of each component, ergonomic handlebar, adjustable seat, and anti-slip wear resistant tire. 26" Alloy Frame. Head tube 50 x 50 x 150L.The pipe heterotypic 27.4 x  2.2T x 490L. important Size:Top Tube Length:565mm; Saddle to the ground:920-1070 mm. Please check the description page for more detailed information. Note:To keep the battery alive, our warehouse uses an extension charging cord (batteries need to be changed regularly to keep them alive), the cord is of no use for you. If you receive this card, please ignore it, there is a professional charger in our packages, please use the correct charging equipment to charge.