Disney Cars RideMakerz 49 Mhz R/C Chassis and Transmitter Full-Funtion w/ Sound for "DOC HUDSON'S" Disney Cars RideMakerz 49 Mhz R/C Chassis and Transmitter Full-Funtion w/ Sound Body and Wheels Sold Separately. Includes Chassis, Key and Transmitter. Battery Requirements: Chassis: 4 of AA; Transmitter: 1 of 9V.