Features Quickly trace and identify cables among lots of unknowncables. Check continuity of Lan cables. Track the cables or wires, and diagnose the breakage. Visible indication: pin-to-pin cable map for individualcable (not by pairs). Low Voltage alarm function. Earphone permits use in noisy environments. LED light assists use in dark corners. Specification NF-801 Transmitter specifications Tone frequency 200Hz Max. distance of transmission Up to 2 kilometers Max. working current Less than 10mA Volume Regulate Function Audio volume level control Tone mode 2 Tones, adjustable Compatible connectors RJ11,RJ45 Max. signal voltage 8Vp-p LED lights display Wiremap, tone, tracing Voltage protection AC 60V/DC 42V Battery Type DC9.0V battery x 1pc (included) Dimensions (LxWxD) 15 x 3.7 x 2cm NF-801 Receiver specifications Frequency 200kHz The Max. working current Less than 30mA Earphone jack 1 Battery Type DC9.0V x1pc (included) Dimensions (LxWxD) 12.2 x 4.5 x 2.3cm