ARM quad-core 64-bit -A35 core, main frequency 1.3GHz, integrated high-performance Codec audio decoder and voice activity detection (VAD) module Built-in Codec, supports up to 8-channel microphone input, easy to develop multi-microphone array applications 2x26PIN extension pin header, supports UART, SPI, I2C and other peripheral control Onboard 8GBeMMC+Micro-SD card expansion (supports SDIO3.0 protocol) to meet large-capacity data storage needs Onboard 512MBDDR3 memory to smooth multi-tasking operation Model: Processor:RK3308B RAM:512MB DDR3 The product appearance and printed words depending on the batch, but this does not affect use. Colour:Black Material:PCB Package Contents: 1 * Development Board 1 * USB Cable 1 * Adapter Cable 1 * Antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.