It's the Arduino Nano v3.0 without header pins! This version doesn't come with header pins populated so that you can solder in any connector or wire. All of the functionalities are the same as Arduino Nano.
Arduino Nano overview:
Arduino Nano is a surface mount breadboard embedded version with integrated USB. It is a smallest, complete, and breadboard friendly. It has everything that Diecimila/Duemilanove has (electrically) with more analog input pins and onboard +5V AREF jumper. Physically, it is missing power jack. The Nano is automatically sense and switch to the higher potential source of power, there is no need for the power select jumper.
Nanos got the breadboard-ability of the Boarduino and the Mini+USB with smaller footprint than either, so users have more breadboard space. Its got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other). This new version 3.0 comes with ATMEGA328 which offer more programming and data memory space. It is two layers. That make it easier to hack and more affordable.
You end up paying less with Nano than Mini and USB combined!
Operating Voltage (logic level)  5 V
Input Voltage (recommended)  7-12 V
Input Voltage (limits)
Digital I/O Pins
14 (of which 6 provide PWM output)
Analog Input Pins
DC Current per I/O Pin
32 KB (of which 2KB used by bootloader)
0.70 x 1.70
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 and serial monitor
ICSP header for direct program download
Standard 0.1 spacing DIP (breadboard friendly)
Manual reset switch
The Arduino 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.