This is a development board compatible with the Arduino Nano. Pin headers and a case are included. These are surplus items from a bulk purchase on an online store in a certain country. These are units I set aside for myself, and I have confirmed that they function correctly with the LED blink (LED lighting program). Depending on the unit, you may need to select `ATmeg328P (Old Bootloader)` in the `Processor` menu of the Arduino IDE's [Tools] menu to upload sketches. #ATmega #Arduino #Electronics #Programming ※ Please be sure to read my profile before purchasing, as it contains information about discounts and shipping methods.