littleBits Electronics DC Motor
This is one individual littleBits bit:
The DC (or "Direct Current") motor Bit rotates a shaft when you send it an ON signal. It even has a switch to set the direction of rotation! Try attaching various things to make windmills, cars, helicopters and more.
What's littleBits? littleBits is an opensource library of electronic modules that snap together with magnets for prototyping, learning and fun.