The SainSmart Nano V3.0 can be powered via the mini-USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
Features:
   ◠Automatic reset during program download    ◠Power OK blue LED on the bottom, Green (TX), red (RX) and orange (L) LED    ◠Auto sensing/switching power input    ◠Mini-B USB for programming and serial monitor    ◠ICSP header for direct program download    ◠Standard 0.1" spacing DIP (breadboard friendly)    ◠Manual reset switch
Specification:
   ◠Microcontroller: Atmel ATmega328    ◠Operating Voltage: (logic level) 5 V    ◠Input Voltage (recommended): 7-12 V    ◠Input Voltage (limits): 6-20 V    ◠Digital I/O: Pins 14 (of which 6 provide PWM output)    ◠Analog Input: Pins 8    ◠DC Current per I/O: Pin 40 mA    ◠Flash Memory 32 KB (of which 2KB used by bootloader)    ◠SRAM 2 KB    ◠EEPROM 1 KB    ◠Clock Speed 16 MHz
Pack List:
   ◠1x SainSmart Nano 3.0 Board    ◠1x mini USB Cable