Integrated 512 KB SRAM, 384 KB ROM, 16 KB RTC SRAM, and 4 MB Flash Memory Integrated Bluetooth LE wireless and 2.4 GHz Wi-Fi for superior RF performance USB Type-C interface eliminates the need for forward and reverse plugging Rich peripheral interfaces, onboard 64 RGB beads to form an 8x8 bead array, which can be used to display cool lighting effects or simple images. Supports multiple low-power operating states, which can adjust the balance between communication distance, data rate and power consumption to meet the power requirements of various application scenarios. Colour:Black Material:PCB Package Contents: 1x Development Board 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.