Amazon.com : Vivi Electric Bike for Adults 26" Ebike, 500W Folding Electric Bike, 20MPH Adult Electric Bicycles with Removable 48V Battery, Up to 50Miles Range, Shimano 21 Speed, Dual Shock Absorber :
Amazon.com : ANCHEER 500W Electric Bike 27.5'' Adults Electric Commuter Bike/Electric Mountain Bike, 48V Ebike with Removable 10/10.4Ah Battery, Professional 21 Speed Gears : Sports & Outdoors