... needed. 1, Plug and play, small volume, easy installation 2, Port-powered, high efficiency obtain electricity, can also worked on 3 lines ... 5% to 95% Input powered: No power supply needed, powered from TXD, RTS, DTR signal in RS-232 port Consumption: Static consumption less ... : Plastic Color: Black Weight: 50g RS-232/485 Converter(Industrial Port-Powered Isolation )