KEYESTUDIO UNO R3 Board ATmega328P ATMEGA16U2 with USB Cable for Arduino FAST TRANSFER AND MORE MEMORY: USB-TTL used ATMEGA 16U2 chip, controller used ATMEGA 328P chipUS ATMEL original EXCELLENT QUALITY: solder is very clean, everything is aligned nicely, all boards will make function,voltage, current testing before packaging, a small colorful booklet to help how to use it BEAUTIFUL LOOK & PACKAGING: cool yellow-black design which is a departure from the standard, dull, black boards, the yellow silk screen on black mask make it easy to read the pin labels FCC and CE CERTIFICATION: this board made from environmentally friendly components and materials, as well as environmentally friendly production technology, it is really safe We also have a one-stop store that provides various of open source hardware for arduino, raspberry pi and micro bit, you can access this page at https://www.amazon.com/keyestudio