Features 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 SUPPORT PARALLEL PORT: Support USB to printer parallel port and EPP or MEM parallel port, very versatile and multiple function SUPPORT SERIAL PORT: USB port converter module support USB to UART, I2C, SPI interface, useful and practical, provide great convenience ONBOARD INDICATOR: Output voltage and level signal can choose 3.3V or 5V, onboard UART and SPI or I2C working status indicator 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. 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