Features:This item is designed for cable network system installation and network technician to diagnostic network problem. Wire finding is a major unique function where other cable checkers do not have it， it can locate up to 3000m long wire or cable even in a complex PC network or telephone system. It also has a built-in LAN cable mapping function， to quickly diagnostic LAN cable condition and to identify fault point or broken connection. Bright red LED torch and External Earphone support is value added function to enable service technician to work conveniently and comfortably in dark and noisy environment. Energy saving standby mode 7.Line-tracking function ( fast and reliable ) 8.On-line functions ( 18 indicators， short circuit，open circuit， cross， ect. glance ). Description: Cable Tester for UTP STP RJ45(manual switch)Automatic efficient scan for the miss wiring， disorder cable， open and short circuitTEL BNC test available(Adapter needed)Remotely test cable up to 1000 ft in length ( remote kit included )Protective power switch for low power consumptionHigh quality protecive case provides more secure protectionJudge continuity of the cables or wiresTrack the cables or wires， and diagnose the break pointReceiver the tone signal on the cables or wires (telephone line)Identify the state in the working telephone line (clear ring， busy)Send a single solid tone or a dual alternating tone to the object cables or wires Specification: Working current: Tester: 10mA Receiver: 30mASignal transfe mode: Digital signalSignal output level: 8Vp-pSignal transfer distance: 3KmDimension:Transmitter: 126x49x34mm Reveiver:175x42x25mmPower: by 2 x DC 9V Battery( not included) Description: 1. 100% brand new 2. Streamlined design and easy to carry 3. Comes with earphones usable in noisy situation 4. Flexible and versatile interface 5. Sensitive and adjustable volume control Package Included: 1 x Cable Emitter 1 x Cable Receiver 1 x RJ11 Cable 1 x RJ45 Cable 1 x Earphone 1 x Cable with Crocodile Clamp 1 x Instruction Manual