Air Scooter

An Air Scooter is (usually) a handheld device that acts as a vehicle.
They tend to be something that is around 30cm long and 20cm-ish wide. they consist of a small tank of compressed air, and a compressor for refilling it. This is powered by a battery. there is also a handle with a trigger, (and a loop for the users wrist) and one or more nozzles.
The user grips the handle, and when the trigger is pressed, compressed air is released through the nozzle.
These are used in zero G environments (with air) to move around. Simply point the scooter in the direction you wish to go and pull the trigger. The jet of gas pulls the user around. As soon as the gas starts to be used, the compressor inside starts to refill the tank.
There are many, many models of these. Think of them much like any other piece of consumer electronics / hardware.