Meet Microduino mCookie: a stackable Arduino microcontroller for makers of all ages and skill levels. These are stackable and magnetic, allowing you to work on robots and other interactive projects. No need to deal with any wiring, soldering, or complex programming to get started.
This particular kit has various modules: 1 core USB module, 1 Bluetooth module, and 1 battery management module. You also get a sensor hub module with 6 sensors. Instructions for creating a WiFi lamp and other projects are included.