OSOYOO for Arduino Nano Board ATMEGA328P Module CH340G Mini Microcontroller Shield with Solder pins Without USB Cable 1 pairs of TTL level serial transceiver ports RX / TX Using Atmel Atmega328P-AU MCU, Support ISP download Support USB download and Power Support for external 5V~12V DC power supply, Support power supply by 9V battery You can learn more about how to use the item on the link: http://kiguino.moos.io/2014/12/31/how-to-use-arduino-nano-mini-pro-with-CH340G-on-mac-osx-yosemite.html