Feature: 1. SUPPORT SERIAL PORT AND PARALLEL PORT: CH341A conversion module is equipped with CH341A chip, which is a USB bus transmission chip. Providing asynchronous serial port, printing port, parallel port, and commonly used 2 wire and 4 wire synchronous serial ports through USB bus 2. WIDE APPLICATION: This module can be used for serial port expansion, I2C interface EEPROM and SPI interface FLASH, as well as for STC microcontroller programming, program debugging, data acquisition, etc. 3. SUPPORT PARALLEL PORT: Support USB to printer parallel port and EPP or MEM parallel port, very versatile and multiple function 4. SUPPORT SERIAL PORT: USB port converter module support USB to UART, I2C, SPI interface, useful and practical, provide great convenience 5. ONBOARD INDICATOR: Output voltage and level signal can choose 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