This motor is a brushless gear motor and cannot reverse. On a 26-inch bicycle, the 250W motor can reach approximately 35 km/h, the 350W motor can reach approximately 40 km/h, and the 500W motor can reach approximately 45 km/h.  

This kit does not include a battery; a battery must be purchased separately. Both lead-acid batteries and lithium batteries are compatible. Recommended battery capacities: 24V 15Ah, 36V 12Ah, and 48V 10Ah

This kit includes:
1). 1x 250W / 350W / 500W brushless hub motor (front-wheel drive)
2). 1x motor controller
3). 1x handlebar throttle (or thumb throttle)