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Specification: The length of handlebar: 18.11 inch Wheelbase: 10.63 inch​​ Front wheel diameter: 7.48 inch Rear wheel diameter:7.48 inch Seat and the ground distance: 28 inch Handlebars and the ground distance: 32.1 inch Cushion width: 7.87 inch Cushion thickness: 1.57 inch 1.Please note that in order to prevent you from falling,the speed of the electric tricycle must not exceed 6 km/h when turning. 2.The best charging time for ES31 electric scooter is 3.5-4 hours. Please do not exceed this range, otherwise it will easily damage the charger or battery. 3.It should be noted that the front of the tricycle cannot be folded. Please don't do that to avoid product damage.（The manual is wrong, in fact, the head of the ES31 cannot be folded，but ES30 can.） 4.The rear wheel is fixed ，need to decelerate before turning, otherwise will easily fall when the speed more than 5 km. 5.When the handle is loose, please check if the large socket head cap screw on the top of the front is adjusted. . Warranty: Battery One-year warranty:Unauthorized removal of damaged batteries or plug-ins, use of non-company standard chargers, battery damage, short-circuit or long-term failure to charge caused by human factors such as water is not guaranteed. Motor and Reducer One-year warranty:Unauthorized removal, or man-made damage caused by water, severe impact, tire stall or blockage is not guaranteed. Control system One year guarantee:Can not be restored due to performance failure except for overloaded driving or other human causes would be guaranteed. Charger One year warranty: The battery is normally attenuated by more than 50% (except for human factors), and battery maintenance can be performed within 12 months. There is no warranty for human causes.