A main unit (gun): This houses the motor and trigger mechanism.
Batteries: The image shows two 48V batteries, indicating it's a cordless, rechargeable unit.
Hose: For drawing water from a source.
Spray wand/nozzle: For directing the high-pressure water stream.
Foam bottle: Used for applying soap or detergent, especially for car washing.
Carrying case: A case for storing and transporting the components.