Here's some handy specs! Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in Light as a (large?) feather - 4.8 grams ATmega32u4 @ 8MHz with 3.3V logic/power 3.3V regulator with 500mA peak current output USB native support, comes with USB bootloader and serial port debugging...

on-line instructions: http://osoyoo.com/2018/06/25/osoyoo-pro-micro-board Note:When you open the Arduino IDE software, pls go to the Tool and choose the board "Arduino Leonardo"We have tech support for after-sale. If it can't be recognized by your computer when you use it, please change another USB...