Microcontroller: ATmega328P (or ATmega328)
Operating / Logic Voltage: 5 V
Input Voltage (recommended): 7–12 V
Input Voltage (absolute limit): 6–20 V

Digital I/O Pins: 14 pins (6 PWM capable)
Analog Input Pins: 8 (A0–A7)
DC Current per I/O Pin: 40 mA

Flash Memory (Program Space): 32 KB (2 KB used by bootloader)
SRAM: 2 KB
EEPROM: 1 KB

Clock Speed: 16 MHz
Dimensions: ~45 mm × ~18 mm
USB Interface: Mini‑USB (some variants use USB‑C)
Serial‑USB Chip: CH340G (on most clones)
Current Consumption: ~19 mA