Features main changes from the older version add two rows of the holes for the pins. So it may serve as connected with normal dupont line. Add 3 rows of the holes for wiring. Change the in, Line package of atmega328p to flat package. Ch340g replace atmega16u2testing we program & test all devices with led blinking program. Please make sure to connect the tool for usb & test if the led, L is blinking, This shows the device is working perfectly don t modify program without completing this preliminary test . Usage instructions install ch340 usb driver download http //goo. Gl/nwez9o install arduino ide download http //arduino. Cc/en/main/software connect board to computer & launch arduino ide. Select board as uno in arduino ide. Select the com port you can know com port no. In control panel > device manager . Start burning your programs. Technical details microcontroller atmega328 digital i/o pins 14 of which 6 provide pwm output analog input pins 6 dc current per i/o pin 40ma dc current for 3. 3v pin 50ma atmega328 of which 0. 5kb used by bootloader sram 2 kb atmega328 eeprom 1 kb atmega328 usb chip ch340gpackage content 1 x piece arduino uno r3 compatible development board, Atmega328p ch340. 1 x usb cabledupont pins