STM32 microcontroller with LQFP64 package STM32F401RE; Two types of extension resources; Arduino Uno Revision 3; Extension pin headers for full access to all STM32 I/Os; mbed-enabled (mbed.org); On-board ST-LINK/V2-1 debugger/programmer with SWD connector; Selection-mode switch to use the kit as a standalone; ST-LINK/V2-1 Flexible board; Power supply: USB VBUS or external source(3.3 V 5 V 7~12 V); Power management access point; Three LEDs: USB communication (LD1) user LED (LD2) power LED (LD3); Two push buttons: USER and RESET; USB re-enumeration capability: three different interfaces supported on USB Virtual Com port; Mass storage Debug port; Comprehensive free software HAL library including a variety of software examples; Supported by wide choice of Integrated Development Environments (IDEs) including IAR Keil GCC-based IDEs