Main Chips: CH343P, SP3485EN-MS Interface Type: USB Type-C (supports reversible plug) Communication Protocol: TTL (UART) / RS485 Supported Voltage Levels: 1.8V/3.3V/5V (can provide external power, maximum 300mA) Operating Modes: USB-TTL / USB-RS485 / TTL-RS485; Baud Rate Range: USB-TTL: 50bps ~ 6Mbps / USB-RS485: 6Mbps / TTL-RS485: 12Mbps; RS485 Transmission Distance: Depends on the anti-interference capability of the transmission cable, the size of the transmitted data, and the baud rate. Baud rate and data size are inversely proportional to the transmission distance. Flow Control Support: RTS (Output Control), CTS (Input Control) Protection Mechanisms: Input reverse connection protection; RS485-A/B pin ESD electrostatic discharge protection. (The product printed words may vary depending on the batch, but this does not affect use) Color: Black Material: PCB Package Contents: 1*USB to Serial Module 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.