500W lithium-ion battery allows for pure electric mode at least up to 18.9 miles at least and pedal-assisted mode up to 31miles (the actual performance will be affected by the user's weight, road). The removable and built-in lock battery ensures no worry of being stolen. Enough for a day adventure or most weekend trips back. Shimano's professional 7-speed transmission system ensures reliability and durability. Dual disc brakes and an electronic anti-lock braking system ensure riding safely. New design the horn and the bright led headlamp are equipped for safe night riding.