Using FT4232HL chip, high-speed communication is stable, reliable and has good compatibility Support USB to 2-way isolated RS232/485 + 2-way isolated RS232 Onboard integrated power isolation provides stable isolation voltage and no additional power supply is required at the isolation end. Onboard integrated digital isolation, capable of signal isolation, high reliability, strong anti-interference, and low power consumption The onboard (transient voltage suppressor) can effectively suppress surge voltages and transient voltages in the circuit. The onboard -Pattern protection and anti-static fuse and protection diode can stable current and voltage output and prevent overcurrent. Overvoltage, improve impact resistance Built-in RS485 output terminal 120R resistor, can be enabled through jumper cap, flexible switching 9 external LED indicators for easy viewing of power supply and signal transceiver status Industrial-grade metal casing supports both wall-mounted and rail-mounted installation methods. It is sturdy, beautiful, and easy to install. Due to different batches, the appearance, color and printed words of the product , which not affect the use. Material: Aluminum alloy colour: Black Package Contents: 1 x Kit 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.