This tester is a multipurpose network cable length tester with 3 major functions: hunting, wire sorting and circuit status testing with reliable accuracy. A highly recommended tool for technicians in installation and maintenance of weak current system such as communication line, comprehensive wiring circuit, etc. Features: Audio probing and cable tracing function Check wiring error in 5E, 6E, coaxial cable such as open circuit, short circuit, jumper wire, reverse connection or cross-talk interference Locate the wiring or connection error Measure cable length and determine the distance of open circuit and short circuit Dynamically calibrate cable length and make length measurement as accurate as 97% Directly find the RJ45 cable In search for other metal cable Measuring network line-break Measure twisted-pair length Auto power off function Portable unit with long battery life Automatically time-delay shut off Measure length and pair with or without the far-end recognizer Locate cable and there are 8 far-end passive (remote identifier) test jacks [1D1-ID8] (Note: only 1 ID1 is included on set ) Far-end recognizer (remote identification) with prompting voice Self-checking function Automatically compensate any change in battery capacity or ambient temperature Single board computer software watchdog design with reliable operation Specifications: Display: Special 4 x 16 character big screen LCD lattice(valid visual field 61.6 x 25.2mm) Type of Cable Tested STP/UTP twin twisted cable Coaxial cable (RJ45-to-BNC converter is not included in the set) Type of cable detected 5E & 6E Coaxial cable (RJ45-to-BNC converter is not included in the set) Other metal wires Tester Port Tester RJ45 master port (L), tester LOOPBACK RJ45 port (R) Length Measurement of Twin Twisted Cable Scope: 1~350M ( 3 ~ 200ft) Calibration accuracy: 3% (±0.5M or ±1.5ft) (calibrating cable > 5M) Shipment accuracy: 5% (±0.5 M or ±1.5 ft) (AMP, AT&T Class 5 cable) Display: M (meter) or ft. (feet) Length Calibration User can set calibration factor by himself with a given length cable Length of calibrating cable is more than 5M Wire Sequence and Locating Cable Error: Check errors such as Open circuit Short circuit Reverse connection Cross-over or cross-talk interference Locating Cable: 8 Remote identifier test jacks (ID1 to ID8) (Note: only one ID1 is included in set) Automatic Time-delay Shut Off Time: if idle for 30 minutes Power Supply Main Unit: 4 x 1.5V AA batteries (not included in set) Receiver: 1 x 9V battery (included) Overall dimension Main tester: 180 x 80 x 40mm Receiver: 218 x 46 x 29mm Remote Identifier: 77 x 31 x 21mm Set Includes: 1 x Main Tester (Emitter) 1 x Receiver 1 x Recognizer (Remote Identifier) 1 x Toolkit Bag 1 x RJ45-to-Alligator Clip 1 x RJ45-to-RJ45 Cable 1 x Earphone 1 x English User Manual 1 x 9V Battery (FREE) Colored Packaging Box