Features: 1.Wide Application: This wire tracer is very suitable for tracking RJ11, RJ45, network cable, telephone line, BNC cable, single wire, optical fiber line. 2.Cable Collation: This wire tracer can test physical connection status of network cable, such as open circuit, short connection, miswire and reverse connection. 3.Continuity Checking: This wire tracer can check continuity of the tested wire. Please notice that the TONE and CONT indicators do not indicate the working status but the measuring result. 4.Support Earphone: This wire tracer is equipped with a headphone jack, you simply connect the headphone to headphone jack to get clear information in the noisy environment, adjust the volume knob to keep the volume appropriate and avoid interference. Please note that if the noise is low, check whether the battery is powered off. 5.Necessary Tool: This wire tracer is necessary testing tool for telecommunication engineering, wire engineering and network maintenance person. specification:Item Type: Wire Tracer Material: ABS Supports the Following Types of Cables: Network Cable, Telephone Cable, Bnc Cable, Single Wire, and Optical Fiber Maximum Distance of the Test Network Cable: >200m Maximum Wire Tracing Distance: >300 M Maximum Pressure of Emitter: 60V Receiver Maximum Voltage: 9V Transmitter Signal Frequency: 455Khz Battery Type: 9V Battery x 2 (Battery Not Included) Maximum Power Consumption of Emitter: 0.15W Maximum Power Consumption of Receiver: 0.2W Use Environment: Operating Temperature: 0 to 55 Relative Humidity: 10% to 90% (Non Condensing) Storage Temperature: -10 to 60 Relative Humidity: 10%-90% (Non Condensing) PackageList:1 x Emitter 1 x Receiver 1 x RJ11 Clip Adapter Cable 1 x RJ45 Cable 1 x Storage Bag NoteBattery positive and negative measurement function (the voltage of the power supply to be tested must be below DC 36V, and AC 220V cannot be tested directly)