Features: brand new and high quality Micro USB connector, you can give the board power supply and USB communication. Support the full range of S TM32 SWD debugging interface, a simple 4-wire interface (including power), fast, stable; interface definition housing directly marked. Increased the 5V power output, the output I / O ports are protected afraid of operational errors caused by S T-LINK V2 damage. for HID device, no need to install driver, support WIN10 system. SWD download mode, for most Arm core chips. Specifications: Material: ABS+Metal Size: 6x1.8cm/ 2.36x 0.7 in Rx: Virtual serial port receiver Tx: Virtual serial port sender SWCLK: SWD clock port SWDIO: SWD data port GND: Ground 3.3V: 3.3V power output (maximum providing 250ma current) 3.3V: 3.3V power supply 5V: 5V power output (host USB power supply) 5V: 5V power supply Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x Emulator Downloader