LittleBits

Electronics

LittleBits has a variety of electronics kits designed under the concept of Learning by Doing. It is made up of small modules that can be connected together using magnets. This connection creates circuits immediately, which are powered by connection to a battery.
The combinations are infinite and you can make as many as you want, so you can experiment and switch around the modules any way you like!

The bits include depend upon the model.

More info

These kits help problem-solving skills for kids
The modules can be: sound sensors, light sensors, temperature sensors, motors, lights, speakers, buttons, etc
Assists with understanding of new concepts from electronics and programming
Create interactive projects with no prior knowledge required