Educational invention kit allows you to connect various interesting things as input. And it can trick your computer into thinking that almost everything is a keyboard.There is ATMega32u4 on the machine, it uses the Human Machine Interface Device (HID) protocol to communicate with the computer, which means it can work like a keyboard or mouse. The kit uses high-resistance switches to detect connections, even through non-conductive materials.It is made of good quality PCB material, durable to use.The length of this product is 9.4cm, the width is 4.8cm and the height is 1.08cm.It is suitable for educational engineering and computer coding activities.Item Name: Main Control BoardMaterial: PCBInput Voltage: DC 5VMini USB: Power Supply, Data TransferMain Control IC: ATMEGA32U4Features: Practical, Convenient, Easy OperationSize Details: 9.4cm x 4.8cm x 1.08cm/3.7" x 1.89" x 0.43" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Main Control Board10 x Clip1 x USB Cable10 x Wires