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+PC Display: LCD Tone Frequency:225kHz Maximum Transmission:2km Maximum Cable Map:350m Maximum Working Current:≤70mA Compatible Connectors:RJ11,RJ45,Coaxial,USB Maximum Signal Voltages:15Vp-p Voltages Protect:AC60V/DC42V Low Battery Display:LCD6.5V Battery Type:DC9.0V(Not Included) Package Includes: 1xMain Tester(Battery Not Included) 1xReceiver 1xManual 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.