... 8'' wide front caster, 12'' real wheel, stepless versatile controller, dual motors driving for real wheel, two storage batteries, foldable backrest, detachable ... controller, simple and easy to operate, make it safer to use;Foldable backrest, more convenient to carry after folded; summer/ ... , then it can shorten battery life; charging timely after use in order to ensure the battery life;3. After power ...