RISC-V 32-bit single-core processor, the main frequency is up to 160 MHz. Built-in 400 KB , 384 KB ROM, support external SPI/Dual/Quad SPI Flash. Support 2.4GHz WiFi and low-power Bluetooth (Bluetooth LE) dual-mode wireless communication, with excellent RF performance. with 0.42-inch OLED display, SSD1315 (driver compatible with ), resolution 72x40. (Due to different light or display, the actual object may have color difference, but it not affect the use) Color: black Material: PCB Package Contents: 1 x 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.