The latest version of the TopMate ES31 electric scooter for adult has a longer rear axle which is 15.7in. Longer rear axle makes riding more stable. The electric tricycle adopts a foldable design, The weight is only 14kg (30.86lb), The electric tricycle has three adjustable speeds, the maximum speed is 15 Mph, and it can ride 15.5-18.6 miles when fully charged. It is an ideal mobility scooter for outdoors and traveling.