The base unit of the cable tester can be connected via a network cable directly to a hub or switch to test wire connections, or to a network card to test the send receive pairs of wires, it can test if there is any open or miss-wire without the remote kit. 9 Led's to show you exactly which wire is open or miss-wire on both remote and master unit. Old version has 4 Led's. Master and Remote unit are both included. Automatic scan mode, Rapidly Testing. Power switch is not a push button will not easily turn on and waste battery." "Test the correct pin configuration of 10/100 Base-T 10Basc-2 Thin Ethernet cable Easy to verify cable continuity, open, short and miss-wire With remote kit, it can remotely test cable up to 1000 ft in length either on wall plate or patch panel. Can test the grounding. Auto scan with 2 speeds for pin-out Indicators. A power switch is provided for saving Battery Power. 9 Volt Battery.