The only part that is attached separately from the wheel is a simple thumb activated throttle, which is easily clipped onto your handlebar.

The Panasonic 36V removable Lithium-Ion battery (with a built in USB outlet for charging your electronics) provides a pedal assisted range of up to 50 miles per-battery (up to a 30 mile range for the 26 inch wheel). With little to no pedaling you will go up to 20 miles on a single battery (up to 12 miles for the 26 inch wheel). The more you choose to pedal the more range you can expect, and you can always take a spare battery with you for longer rides.