STM32F407VGT6 microcontroller featuring 32-bit Arm® Cortex®-M4 with FPU core, 1-Mbyte Flash memory and 192-Kbyte RAM in an LQFP100 package USB OTG FS ST MEMS 3-axis accelerometer ST-MEMS audio sensor omni-directional digital microphone Audio DAC with integrated class D speaker driver User and reset push-buttons Eight LEDs: LD1 (red/green) for USB communication LD2 (red) for 3.3 V power on Four use