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SEEED STUDIO SEEEDUINO V4.2 (100% ARDUINO UNO COMPATIBLE) 102010026
Seeeduino V4.2 is based the Arduino UNO bootloader, and with an ATMEGA16U2 as a Uart-to-USB converter. You can program and power the board via a micro-USB cable. Also you can power the board via a DC Jack input, 7 to 15V is acceptable. There's 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.
Finally, the three on-board Grove interface can make your board connect to Grove Sensors easily.