Seeeduino V4.2 (ATMega328P) Arduino Uno R3 Compatible MCU Board
Seeeduino V4.2 is based on the Arduino UNO bootloader and with an ATMEGA16U2 as a UART-to-USB converter which means that the board can basically work like an FTDI chip. You can program the board via a micro-USB cable. Also you can power the board via a DC Jack input 7 to 15V is acceptable. Theres a switch to choose the system supply voltage 3.3V or 5V which is very useful if you want to set the system to 3.3V to save power.
ATmega328P microcontroller
Arduino UNO bootloader
14 Digital I/O Pins (6 PWM outputs)
6 Analog Inputs
ISP Header
Arduino UNO-R3 Shield Compatible
Micro USB programming and power supply
3 on-board Grove connectors
3.3/5V system operation power switch