Features: The TWen32F003/CH32V003F4P6 development board is powered by RISC V processor 32-bit RISCV2A processor with 2-level interruptnesting；ARM 32-bit MCU provide a full set of source code Up/down resetprogrammable voltagedetector One 16-bit advanced timer and one 16-bit general-purpose timer continuously upgraded zerobased practical development textbooks For developers, students, and DIY enthusiasts who want to explore the embedded system and programming. Specifications: Core Board ：TWen32F003/CH32V003F4P6 Frequency：up to 48Mhz system 2KBsram 16kb Flash Power Supply voltage: 3.3/5V 1 set of 10-bit ADC 1 USART interface 1 set IIC interface 1 set SPI interface 18 I/O ports 1 extenal interrupt 64-bit ChipID Package Includes: 1PC Core Board note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.