CH344L chip, high-speed communication is stable, reliable and compatible. The 4-way isolated RS485 interface can be expanded through USB, which is convenient for users to expand access to multiple RS485 industrial serial port devices. The onboard integrated power isolation can provide stable isolation voltage, and no additional power supply is required for the isolation end. The onboard self-recovery fuse and protection diode can stable output of current and voltage, prevent overcurrent and overvoltage, and improve impact resistance. The built-in RS485 output terminal 120R resistor can be enabled through the dip switch, and the switching is flexible. Colour:black Material:ABS The actual product may have slight color difference or difference, which not affect the use Package Contents: 1 x Isolated USB To 4Ch RS485 Converter 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.