Features: brand new and high quality This instrument is a multi-functional handheld cable testing tool. Work perfect when RJ11 RJ45 cable is on power. It has a wide application with reinforced cable types and multiple functions.It's a necessary testing tool for telecommunication engineering, wiring engineering, and network maintenance person. Support POE Switch online test; online test network cable; optical fiber cable test(option); Support polarity of power source test;Support BNC and RJ11 line trace Built in scan voice and speed set function;Emitter support auto power-off. Specifications: Support cable type:4P/8P network cable,telephone cable,BNC cable,single-wire Test max distance:>200m Scan max distance:>300m Support max voltage:48V(only ejector) Signal frequency:455Khz Battery type:9V Type: Without-Laser / With-Laser (Optional) Color: Black Ejector power consumption Max:0.15W Receiver power consumption Max:0.2W optical fiber power:5mW Operating Temperature: -10 -60 Relative Humidity: 10%-90%(non-condensing) Storage Temperature: -20-70 Relative Humidity: 5%-90%(non-condensing) Scope of Application: for Education,Home appliance,Industrial, Market, Office, Supermark Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 x Emitter 1 x Receiver 1 x User Manual