Quick Facts Tested to 25,000 use-cycles to ensure reliability. Share printers, modems, or other peripherals. Guaranteed for life! Further DetailsMonitor switches monitor system activity via six front-panel LEDs: TX, RX, RTS, CTS, DSR, and DTR. They're perfect for devices with flow-control requirements. Lockable switches come with a key-operated rotary switch for extra security against unauthorized use.