47 C.F.R. § 95.703

Model aircraft. A small imitation of an aircraft, such as an airplane or a helicopter.

Model surface craft. A small imitation of a boat, car, or other type of vehicle for carrying people or objects, other than an aircraft.

Radio Control Radio Service (RCRS). A non-commercial short-distance radio service for wirelessly controlling the operation of devices, including, but not limited to, model vehicles such as aircraft and surface craft.

RCRS transmitter. A transmitter that is used or intended to be used in the RCRS.