The MT-7028 lets you easily locate and verify the cable status and troubleshoot wiring for continuity, shorts, opens and crossover on RJ45 Lan cable Cat 5, 5e, 6,7 (UTP/STP), RJ11/12 Telephone cable Cat. 3 (2/4/6 pin) & normal solid/stranded wire by alligator clips patch cord. Ideal for all installation and maintenance fields of telecommunication, networking, datacom, Audio/Video, cable TV, and all weather cabling, etc.Tone frequency1kHzMax. distance of transmission & cable map3km& 300mMax. working current 65mACompatible connectorsRJ45(8 pin)/RJ11(6 pin) compatible connectors for RJ45(8 pin)RJ11/12(6P/2C/4C/6C)cable map and RJ45 tone,RJ-11(6 pin)connectorsfor RJ11/12(6P/2C/4C/6C) toneNon Contact Voltage detection 90...1000 VBatterytypeDC 9.0V (NEDA 1604/6F22 DC9V 1pcs)