littleBits Pro Library Building Kit Perfect for collaborative, project-based learning at all levels Inventors of all ages can prototype complex interactions in seconds Comes with 3 tackle boxes to store hundreds of Bits on a shelf, or on the go Includes nearly every Bit, featuring cloudBit, Arduino, wireless, and synth Bits (o25 DC Motor, w21 Receiver and w22 Transmitter sold separately) Includes a reference handbook, co-written by littleBits Founder Ayah Bdeir