Radio – Controlled 4 x 4 Size: 16 x 12 x 3,5 cm Color: as shown Material: wooden, cardboard and electronic components Battery and pigment: need to bring your own Experimental principle: After the circuit is connected, the transmission wheels on both sides of the reduction motor output power, and the front and rear wheels are driven to rotate by the transmission belt to drive the car forward. Size: 16 x 12 x 3,5 cm Color: as shown Material: wooden, cardboard and electronic components Battery and pigment: need to bring your own Experimental principle: After the circuit is connected, the transmission wheels on both sides of the reduction motor output power, and the front and rear wheels are driven to rotate by the transmission belt to drive the car forward.