Main features: PoE function: identify which pins are providing power and detect how much voltage . Identify telephone cable condition ( Tip or Ring) / polarity (anode or cathode). Easily trace and locate cables without AC Current noise. Hub blink for locating network port by the flashing port light on Hub / Switch. Measure cable length for Lan cable and Coax cable. Check open, short, cross for Lan cable and Coax cable. Benefits: Different scan modes, easily help locate target cable. Memory and storage function LCD Screen shows test result clearly Technical indexes NF-858 Transmitter specifications LCD screen58 x 40mm Tone frequency130kHz Max testing range2000m Trace cable coonected to switchanti-jamming Compatible with connectorsRJ45, BNC, VFL , Mic USB Low battery display3.4 ± 0.2V Storage data6 sets Battery type3.7V 1000mAh Lithium battary Dimensions (LxWxD)135 x 78 x 35 mm NF-858 Receiver specifications Frequency130kHz Led illumination2 Battery type3.7V 1000mAh Lithium battary Dimensions (LxWxD)203 x 45x 33mm NF-858 Remote unit specifications Compatible with connectorsRJ45,BNC Remote units4 sets Dimensions (LxWxD)107 x 30 x 24mm Accessories Included: BNC-RJ11 Cable adaptor x 1 set RJ45 Cable adaptor x 1 set 8P extender adaptor x 1pc Cable clip x 1 set Charging adaptor x 1 set Lithium battary x 2 sets