littleBits Little bits BITS MODULES PROTO MODULE proto module [domestic regular goods] Just connect the electronic circuit with a magnet! This is a module / accessory related product of a simple and fun electronic circuit "littleBits". If you do not have the littleBits module you want, let's make it yourself. The Proto module can be used by littleBits engineers when prototyping new modules. little Bits has over 50 modules, each of which is categorized into four categories: power, input, output, and wire. With the Proto module, you can access power, ground, and signal lines, and you can perform experiments such as measuring and connecting to external equipment immediately.