DYU D3F Electric Bike, 14" Portable E-Bike, 36V 10AH Battery, 25KM/H, 60KM Range, Dual Disc Brakes, Spring Suspension, Foldable, Unisex Adult. Equipped with a 250W motor and a precision speed sensor, the DYU D3F automatically adjusts motor assistance based on your pedaling cadence, making acceleration and climbing 15° slopes effortless.