Description:-Among the numberous wires and cables，quickly track the desired one.-As for RJ45 and RJ11 socket， it can judge continuity of the cables or wires of network&telephone.-This item is designed for cable network & telephone( with RJ45 and RJ11 socket )system installation and network & telephone technician to diagnostic problem.-When tracking a corresponding line，the indicator is the brightest，voice ie the loudest.-Efficient scan( with RJ45 and RJ11 socket ) for the miss wiring， disorder cable， open and short circuit.-Track the cables or wires， and diagnose the break point.-Receive the tone signal on the RJ45 & RJ11 cables or wires.(telephone & network 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. Features：-As for RJ45 and RJ11 socket， it can judge continuity of the cables or wires of network&telephone.-Among the numberous wires and cables，quickly track the desired one.-When tracking a corresponding line，the indicator is the brightest，voice ie the loudest.-Applicable scope：Telecom network line engineering and routine servicing；computer network line maintenance；other wire line engineering and maintenance.-Streamlined design and easy to carry.-Comes with earphones useful in noisy situation.-Flexible and RJ45 and RJ11 socket for network and telephone.-Sensitive and adjustable volume control.Function：-Open Circuit and Short Circuit Test.-DC Level Testing Function.-Low Voltage Hinting Function.-Headset Function（the earphone we give it as gift）In a noisy environment，you may put on your headset to operate the device to avoid external interference.-Illuminating Lamp Function.At night or in dark environment，you may move the illuminating lamp switch，then the lamp will be on；if it is convenient for you work，you may lock the inching button.-Volume Adjustment Function.Notes before use（Please Read These Carefully Before Use)：-DO NOT use this device on any line with STRONG ELECTRICITY.-You need have two 9V laminated battery(not included)by yourself. Specification： Items: Specs Interface: RJ45 and RJ11 socket Product name: Multi-purpose communication network wire tracker Power supply: DC，two 9V laminated battery(not included) Max.operating: Emitter ≤10mA current : Receiver ≤30mA Singnal transmission format: Multi-frequency pluse Signal output level: 8Vp-p Signal transmission distance: ≥3km NOTE BEFORE USE：DO NOT use this device on any line with STRONG　ELECTRICITY. 　 Package：-1x Cable Emitter-1x Cable Receiver-1x RJ11 Cable-1x RJ45 Cable-1x Cable with Crocodile Clamp-1x Instruction Manual