The E-bike have passed UL 2849 safety standard detection PS:This E-bike supports replacement of backup battery，If you need extra batteries to extend the travel time，Please click the following link to purchase LINK:https://www.ebay.com/itm/394455779805? This Ebike cruise max up to 40 miles on a single charge(PAS Mode), Reach top speeds of 20 mph, which enables you to shuttle freely everywhehre and conquer steep hills climbing, snow riding or a big loading capacity(330lbs) and 30-degree inclines with ease. 500W Brushless Motor: .