USB charging and detailed detail design features. This Crawler car with remote control has a frequency of 2.4 GHZ. The vehicle has a 4×4 traction system. Maximum speed: 20 km. Car length: 39 cm. Car: 1 x 7.4 V Ni-CA rechargeable battery works. Rechargeable Battery and USB charger are included in the box. Control: Powered by 2 x 1.5V AA batteries. Batteries are not included in the box.