Features:Directly hunt, telephone wire, coaxial cable, USB cable and other cable.Check wiring error in, coaxial cable, such as open circuit,short circuit, reverse connection.Measure cable length and determine the distance of open circuit and short circuit.Automatically time-delay shut off and back light display function.Wide Application: necessary testing tool for telecommunication engineering, internet bar, network maintenance, etc. Specifications:Material: ABS+PCDisplay: LCDTone Frequency:225kHzMaximum Transmission:2kmMaximum Cable Map:350mMaximum Working Current:70mACompatible Connectors:RJ11,RJ45,Coaxial,USBMaximum Signal Voltages:15Vp-pVoltages Protect:AC60V/DC42VLow Battery Display:LCD6.5VBattery Type:DC9.0V(Not Included) Note:Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1xMain Tester(Battery Not Included)1xReceiver1xManual