CPU:XuanTie C906 RISC-V CPU Memory: 512MB DDR3 Display Output: RGB 1080p@60fps ,MIPI 1080P@60fps , -compatible 4K@30fps Wireless network: onboard 2.4G WIFI+BT module, 2.4G antenna, connector USB connection: one USB type-a female USB OTG type-c female (on the core board) Audio circuit: on-board 3W speaker driver circuit and electret microphone Storage circuit: the core board has a TF card connector; A WSON8 pad is reserved on the backplane (SPI FLASH is supported) Extended connection: onboard 30P FPC connector (can be connected to Mic R6 microphone board) GPIO expansion: through 2 x 20P 2.54mm pad leads out GPIO and power supply for users Other functions: one WS2812 RGB LED, one reset button button Overall dimension: 65mm x 40mm color:Black Material:PCB+Metal Package Contents: 1 x for RV Dock expansion board 1 x D1 core board 1 x Data cable 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.