Trek's electric-assist system constantly adjusts power output based on your pedaling force and speed. Here you can see the handlebar console that you use to choose the level of assistance you want. It also displays important data like speed, distance and battery level. The list below tells what each button and display does.

1) Odometer/Trip/Counter/Clock/Chronometer/Average Speed
2) Current Speed
3) Current Assistance (A) or Generation (G)
4) Power-Assist or Generation Level
5) Battery Level
6) On/Off (cycles through screen elements #1)
7) Increase Electric Assistance
8) Decrease Electric Assistance/Increase Generation
9) Reset Functions