This is a powerful 7.2V Electric Airplane motor with a 5" propeller. The kit also includes a bracket to attach the fan to the Trekker, a high current 1 relay driver board, a capacitor for the motor, and all the necessary wires and terminals.
We have a bunch of power supplies laying around. This is a bag of 3 randomly selected 9VDC power supplies (wall warts). 110VAC input. About 6 inches of wire with no ends. If you need a power supply (wall wart), you can't beat this deal.