What is mBot servo pack?mBot servo pack is a 3-in-1 pack based on mBot. You can construct "Dancing Cat", "Head-Shaking Cat" and "Light-Emitting Cat" with mBot and the components in this pack.mBot servo pack makes mBot more vivacious and enjoyable, which is of benefit to children's creative thinking.The first cat: Dancing CatDancing cat dances with music,waving little claw, calling you home.The second cat: Head-Shaking CatLooking around for you with its big eyes.Cute, lively and cheerful.The third cat: Light-Emitting CatA nice cat brightens up your life.The light pierces the darkness,It's brighter in the sun.Example：SpecificationsModelmBot Servo PackTypeExpansion packWeight235g (8.29oz)Outer packing size(length×width×height)100×60×150mmPart List4 × Brass Stud M4*2520 × Screws M4*810 × Nut M42 × 6P6C Cable -20cm-black2 × Plastic Ring1 × 9g Servo pack1 × RGB-LED V1.11 × RJ25 Adapter2 × Bracket 3*32 × Plate I1 -blue1 × Wrench M5+M74 × cuttable linkage (blue)