Single Wheel Electric Self Balancing Scooter

We are offering student single wheel electric self-balancing scooter bluetooth music player 40kmh optioanl：
specification:
size:14inch
max speed:18kmh(alarm 12kmh)
max load:120kg
cruising distance:18-20km,depends on the weight of rider, road conditions anambient temperature.
Tire size:360mm vacuum tire
electric unicycle weight:9.8kg
super motor power:350w(450w 500w optional)
voltage:60v
battery capacity:2200mah.(2900mah 4400mah optional)
lithium battery:132w(battery with load balancing,charging&discharging protection function)(174w 264w optional)
working temperature:-10-40degree(best 10-30degree)
charging voltage:60-90mins
dimensions:height 450mm length 395mm,maximum thickness 160mm,minimum thickness 70mm
pedal distance from the earth:112mm