Specification: ATmega32u4

Microcontroller:ATmega32u4Operating Voltage:5VInput Voltage (recommended):7-12VInput Voltage (limits):6-20VDigital I/O Pins:20PWM Channels:7Analog Input Channels:12DC Current per I/O Pin:40 mADC Current for 3.3V Pin:50 mAFlash Memory:32 KB (ATmega32u4) of which 4 KB used by bootloaderSRAM:2.5 KB (ATmega32u4)EEPROM:1 KB (ATmega32u4)Clock Speed:16 MHzLength: 68.6 mmWidth: 53.3 mmWeight: about 20g

UNO R3 (CH340G) MEGA328P for Arduino UNO R3 (NO USB CABLE)

Digital I/O Digital input/output terminal, a total of 0 ~ 13.

   Analog I/O Analog input/output terminal, a total of 0 ~ 5.

   Support the ISP download function.

   The input voltage: when connected to the computer USB without external power supply, external power supply 5 v ~ 9 v dc voltage input.

   Output voltage: 5 V dc voltage output and 3.3 V dc voltage output.

   Using Atmel Atmega328 microprocessor controller