Take your mbots to another level with the add-on pack adding 2 light sensors and a sound sensor to mBot to demonstrate the use of these two commonly used sensors in daily life. Turn your mBot into different robots including Scorpion Robot Light-Chasing Robot Intelligent Desk Lamp or make your own robot.Comes with :2 x light sensor1 x RGB LED2 x light sensor1 x wrench M5+M71 x wound sensor2 x 35 cm cable RJ251 x wrench M5+M72 x beam 0824-0802 x beam 0808-0721 x plate 45°4 x gasket 4*7*3 mm