Battery Type: For Transmitter: AAA Battery x4 (sold separately) / For Car Operating: AAA Battery (Alkaline or Nickel-metal Hydride) x4 (sold separately) [Set Contents] -R/C unit assembled completed chassis -Printed body -Pinion gear (11T, 13T, 15T) -Spur gear (33T, 35T) -Pinion detaching tool -Pairing stick -Wheel wrench -Spare nut