RISC-V 32-bit single-core processor, the main frequency is up to 160 MHz. Built-in 400 KB SRAM, 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 SSD1306), resolution 72x40. (Due to different light or display, the actual object may have color difference, but it will not affect the use) Color: black Material: PCB Package Contents: 1 * 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.