Two - way line control remote controller, motor positive and reverse controller. Load the number five battery and connect the small motor. Click one button and the motor is turning; click on another button and the motor reverses. [size]: 75*30*20mm [weight]: about 14 grams [voltage]: 2 section AA battery, output 3V voltage, small motor suitable for working voltage below 3V [purpose] only by pressing buttons of different colors, the motor can be switched instantaneously and instantaneously. If you press the left button, the motor rotates counterclockwise, then when you press the right button, the motor will rotate clockwise.