1. The 21cm car is 2WD. It uses 3pcs AA battery, which is not included. Please buy the AA battery at your local. 2. The 28cm car is 4WD. It uese rechargeable battery. 3. For all the orders that shipping from China, the battery will be placed inside the battery compartment of the car. Please take off the compartment lip to find the battery. 4. Please charge the battery for about 2-3 hours before the first time use. Because the new battery is lack of power. ==================================================================== Item No.: 5514 Material: Metal+ABS Plastic Function: Move Forward/Backward, Turn Left/Right, Lit light when it drives forward With Real Spare Tire Maximum Climbing Gradient: 45 Size: About 28cm*16cm*15cm (Measured by hand, 1-2cm error may be existed by different measure way) Battery Type: 3.7V (Rechargeable), SM 2P Connector Battery Capacity: 1000mah Battery Charging Time: About 2 Hours Full Charged Battery Lasting Time: About 30 Minutes Remote Control Frequency: 2.4Ghz (Two or more cars can play together, they will not affect each other.) Remote Control Range: About 30 Meters Packed By Retail Box