ATmega328P CH340 chip is used. Improved new version CH340G Replace FT232RL.; Nano V 3.0 card is 100% compatible with the Nano card, and fully compatible with Windows, Mac and Linux operating system.; Works the same as original Nano, runs perfectly on programming software.; Using Atmel Atmega328P-AU MCU, Support ISP download; Support USB download and Power.; Nano CH340 controller is a compact board similar to the R3 board, smaller and breadboard-friendly than Diecimila.