Features Useful and Practical: The USB port conversion module supports USB to UART, I2C, SPI interfaces, useful and practical, providing great convenience. Support Serial Port And Parallel Port: CH341A conversion module is equipped with CH341A chip, which is a USB bus transmission chip. Provide asynchronous serial port, printer port, parallel port and commonly used 2-wire, 4-wire synchronous serial port through USB bus. Support Parallel Port: USB serial port converter module supports USB to printer parallel port and EPP or MEM parallel port, it is a universal converter module. Wide Application: This module can be used for serial port expansion, I2C interface EEPROM and SPI interface FLASH, and can also be used for STC microcontroller programming, program debugging, data acquisition, etc. Onboard Indicator: The output voltage and level signal of the converter module can be selected from 3.3V or 5V, onboard UART and SPI or I2C working status indicator. Specification: Item Type: USB Port Converter Module Support Parallel Port: Support USB to printer parallel port and EPP or MEM parallel port Support Serial Port: Support USB to UART, I2C, SPI interface Output Voltage: Output voltage and level signal can choose 3.3V or 5V Onboard UART and SPI or I2C working status indicator Package List: 1 x USB Port Converter Module Package List 1 x USB Port Converter Module