This is a three wheel ten speed with a 4 cycle motor that can be used at the same time or separately. Lever on the side of the seat is gas, both rear breaks and parking break. 10 speed shift levers are under the front of the seat and the kill switch is on the side. The bike is very quiet thanks to the two mufflers and an expansion chamber. The box on the back is just to hide the motor. Bike is about 39" wide, 34" high, and 83" long and will go about 20 MPH with out pedaling. There is another sprocket that can be slid over for more speed but the way it's set up now I can go slow, through grass, and up hills.