Features: Open407V-D is STM32F4 development board for the official tool STM32F4DISCOVERY, which features the STM32F407VGT6 microcontroller onboards. The Open407V-D supports furtheredly expansion with various optional accessory boards for specific application. The module and open designing makes it for starting application development with STM32F4 series microcontrollers. STM32F4DISCOVERY socket: for easily connecting the STM32F4Discovery USART2 interfaces: easily connection to RS232, RS485, USB TO 232. Easily connection to peripherals modules and more. Specifications: Model: STM32F407 Development Board Size：about 9.6x6.50cm/3.78x2.56in Componnnt：Electronic Component Cored: Core407V STM32F4 Processor：ARM Type: A SPI1/SPI2 + AD ; Ethernet interfaced SPI1 features AD alternative function, supports connecting AD module as well Power: 5V/3.30V Package Includes: 1PC STM32F407 Development Board note: Due to problem of lighting effect there might be tolerances in product, please understand. Please allow 0-2mm error due to manual measurement.