Item Type: Serial Port Module_x000D_ Material: Printed Circuit Board_x000D_ Working Voltage: DC 5V (USB power supply)_x000D_ Function: To achieve simultaneous communication with a single USB to expand 4 UART serial ports. _x000D_ Applicable Scenarios: For electronic equipment, automation equipment. 1FUNCTION: Expanding a single USB to 4 UART serial ports, this serial port module can achieve simultaneous communication. 24 WAY TTL PORT: All the 4 serial ports are using XH2.54 port, and the 4 way UART all have TX or RX indicator to show statue. 3EASY SWITCHING: VCC, TX and RX can switch among 5V, 3.3V, 2.5V and 1.8V, and the switching is very quick and easy as well. 4WIDE APPLICATION: Allows for flexible application on electronic equipments and automation equipments, powerful and useful. 5GOOD WORKMANSHIP: Adopting excellent workmanship, the serial port module is not prone to cold joints, simple to install.Do not use the product in an electrostatic environment, otherwise static electricity will damage the electronic components.1 x Serial Port Module