The Sain Smart Nano for Arduino is a surface mount breadboard embedded version with integrated USB. It is a smallest, complete, and breadboard friendly.
Automatic reset during program download
Power OK, blue LED, Green (TX), red (RX) and orange (L) LED Auto sensing/switching power input
Small mini-B USB for programming
Serial monitor ICSP header for direct program download
Standard 0.1" spacing DIP (breadboard friendly)
Manual reset switch Power: The Nano can be powered via the mini-B 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.