Description: mBot Servo Add-on Pack mainly contains frequently-used 9g servo, RGB LED modules and some other accessaries. It is ideal for useing with mBot Bracket Pack to build interesting and cool project below: 1. Autonomous navigation: When coupled with ultrasonic sensor, it allows the sensor make a 180° sweep of its environment to avoid obstacle better. 2. Spotlight: When 9g servo used with RGB LED, you can build a mobile spotlight to walking in the dark. 3. Dancing Robot: When 9g servo used with linkage, you can build dancing robot by ultrasonic sensor. Part List: 9g Micro Servo Pack  x 1 RGB LED  x 1 RJ25cable-20cm  x 2 RJ25 Adapter  x 1