32-bit RISC-V2A processor with 2-level interrupt nesting support Up to 48MHz system main frequency 2KB SRAM, 16KB Flash Power supply voltage: 3.3/5V Multiple low-power modes: Sleep, Standby Power up/down reset, programmable voltage detector 1 group of 1-channel general-purpose DMA controller 1 group of OPA 1 group 10-bit ADC 1 16-bit advanced-control timer and 1 16-bit general-purpose timer 2 watchdog timers and 1 32-bit SysTick timer 1 USART interface, 1 group of IC interface, 1 group of SPI interface 18 I/O ports, mapping an external interrupt 64-bit chip unique ID 1-wire serial debug interface(SDI) Colour:As Shown Material:PC+Metal Package Contents: 1 x ch32v003 board 1 x wchlinke(Due to different product batches, the appearance may be different, which does not affect use.) 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.