8 speed derailleur 246 % , V- brake and disc brake, mounting rack ,
tachometer, Rear light with battery , front light 36V, lithium battery
and charger, display with load , Number of charges , battery temperature,
and speed , speed control on the handle , Step speed switch , bullhorn cranks
Speed control on
handle and thumb throttle left for starting , braking operation at Ergo grip , left brake casters with brakes and break contact for control Tetra: speed control on the grip handle knob , pedal
brake with contact breaker for control, planetary gear and much more ....