1[Independent 4 Way] The 4 way TTL serial port can independently communicate with 4 XH 4 TTL levels, can be connected externally using matching cables. 2[TYPE C Interface] Convenient to use with a USB cable, most phone cables can be used. Note that cables with only charging function cannot be used. 3[LED Indicator Lights] RXD and TXD of 4 way TTL have LED indicator lights, making the operation status more clear at a glance. 4[3.3V Power Supply Chip] This USB to TTL module uses 1117 3.3 SOT89 packaging chip, capable of outputting 400MA. 5[High Speed Communication] The USB to serial port board supports 4 way serial port high speed communication, ensuring efficient and reliable performance. 1 xUSBtoTTLSerialPortModule