Brake control layout is unusual. The rear brake is actuated by either the right foot pedal or the left handlebar lever. The right handlebar lever works the front brake. Dual rear brake control was puzzling at first, but our first steep hill descent made the reason obvious. The bike's shortness makes the riding position cramped, and a tall person doesn't have a good feel for pedal sensitivity while in a seated position.
Power is regulated through a three speed gearbox and automatic centrifugal clutch.
Operation is similar to an automatic stick shift in a car in that each gear is selected at the will of the rider. Decreasing the speeds by shifting down from higher gears to lower ones is accomplished by pulling the pedal up with your toe a corresponding number of times. Neutral is all the way up. With the engine idling, push the pedal down until it hits a stop to go from neutral to low. You hear a faint clunk but nothing happens.