Arduino UNO R3 Improved Version CH340 Chip + USB Cable

Specifications:
Microcontroller: ATMEGA328P
Operating Voltage: 5V
Input Voltage (recommended): 7-12V
Input Voltage (limits): 6-20V
Digital IO Pins: 14 (of which 6 provide PWM output)
Analog Input Pins: 6
DC Current per IO Pin: 40mA
DC Current for 3.3V Pin: 50mA
Flash Memory: 32 KB (ATMEGA328P) of which 0.5 KB used by bootloader
SRAM: 2 KB
EEPROM: 1 KB