This Arduino UNO R3 ATmega328P CH340G version is optimized in the original version to ensure consistent and compatible with the original, but also easy to use.

General Specification:

Microcontroller: ATmega328
Operating voltage: 5V
Input voltage (recommended): 7-12V
Input voltage (limits): 6-20V
Digital I/O pins: 14 (of which 6 provide PWM output)
Analog input pins: 6
DC current per I/O Pin: 40 mA
DC current for 3.3V Pin: 50 mA
Flash memory: 32 KB of which 0.5 KB used by bootloader
SRAM: 2 KB
EEPROM: 1 KB
Clock speed: 16 MHz