The USB Type-C to four-way TTL serial port module is developed based on the CH3440 chip, which can convert one USB interface into four-way UART serial port. Type-C 5V DC input, with power indicator and four-way UART signal indicator. The input end has a 500mA fuse onboard, which supports overcurrent protection; the output end uses PH2.0 horizontal patch terminal, which has the characteristics of overcurrent protection, high performance, low power consumption and low cost. Instructions for use: 1. Install the USB driver on the computer!!! (Official driver download address: https://.wch.cn/downloads/USBMSER_exe.html) 2. Connect the input end to the computer USB port, and connect the TX and RX of the output end with a jumper cap At this time, the LED power indicator light up. 3. At this time, open the USB device viewer or the device manager that comes with the computer, and the USB device information and four COM ports be displayed; Colour:Blue Material:PCB+Plastic Package Contents: 1 x USB to TTL Serial Module 4 x Short-circuit cap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.