1、PREMIUM PERFORMANCE: USB to for RS232 485 Converter adopts the original for FT232RN chip program, high speed telecommunication is stable, reliable and compatible. 2、ONBOARD TVS: On board TVS (Transient Voltage Suppressor) can effectively suppress surge voltage and transient spike voltage in the circuit, lightning guard and anti static. 3、SAFETY GUARD: Onboard self recovery fuses and guard diodes ensure stable output of current and voltage, prevent overcurrent and overvoltage, and improve shock resistance. 4、TOGGLE SWITCH:: Onboard for RS232 485 telecommunication switching circuit, users can flexibly switch the telecommunication type through the toggle switch. Built in 120R resistor for RS485 output termination. 5、EASY TO USE: External 3 LED indicators, easy to check the power supply and signal transmitting and receiving status.ABS environmental protective shell, compact size, portable and easy to use.