Features: The smaller sized V3 based-on ATmega168 micro-controller (16MHz) can be used with the model board for solderless wiring (experimental board). It has similar structure with Arduino Diecimila/Duemilanove, but different size, to reduce the size, the components are installed on both sides of the printed circuit board. Adopts CH340G chip as UART-USB converter, stable data exchange results can be obtained at 12Mhz operating frequency. The Nano Version3 can be powered through the mini USB port (up to 500mA). The external power supply 6-12v outputs VINor 5V, and the output of the external power supply adjusted to 5V. The power supply automatically selects the max-voltage. This nano ATmega168 has a V3 pin out instead of V2. Package Includes: 1x Development Board Specifications: Material: ABS+Printed Circuit Board Length: Approx. 4.5cm/1.77inch Type: Welding, Non Welding(optional) Technical Parameters of Arduino Nano: 12 digital input/output ports D2-D13. 8 analog input ports A0-A7. 1 pair of TTL-level serial port transceiver ports RXandTX. 6-PWM ports, D3-D5-D6-D9-D10-D11. Using Atmega168P-AU microcontroller. Support USB download and power supply. Support external 3.3V-12V DC-power supply. Support lithium battery and 9V battery power supply. Support ISP download. note: Please allow 0-1cm error due to manual measurement, make sure you do not mind before you order. Please allow slight chromatic aberration due to different display resolutions.