Manufacturer Description This instrument is a multifunctional 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 is a necessary testing tool for telecommunication engineering, wiring engineering, and network maintenance person. General Technical Parameters Operating temperature: 0 - 40 degrees Celsius, maximal 80 percent relative humidity (non-condensing) Storage temperature: -10 - 50 degrees Celsius, maximal 80 percent relative humidity (non-condensing) Altitude: less than 2000m Anti-explosion rating: IP40 Distance of emitting signal: 300m or so Emitter battery: 6F22 / 9V (not included). Receiver battery: 6F22 / 9V (not included) Specification Parameter Product weight: 0.180 kg Package weight: 0.270 kg Product size: 20.00 x 4.00 x 3.00 cm / 7.87 x 1.57 x 1.18 inches Package size: 22.50 x 12.20 x 4.70 cm / 8.86 x 4.8 x 1.85 inches Scope of application: Education,Home appliance,Industrial,Market,Office,Supermarket What's In The Box? 1 x FWT11 Emitter , 1 x FWT11 Receiver , 1 x Clip Adapter Cable , 1 x RJ11 Adapter Cable , 2 X Battery 9V , 1 x User Manual Product Features Tracer function: Tracer function is it can helo you quickly find the line pairs in many pairs, this instrument is suitable for RJ45 interface internet cable, RJ11 interface telephone line, for other metal wire hunt through adapter adapter. Line function: the line detection is on the line of the open, shorted, wrong, reverse the physical connection detection, cable type for enhanced, multi-function, wide range of use. Line level or positive and negative polarity detection: the DC level of the line or positive and negative polarity detection, only the transmitter can be detected. Telephone line test: the work of the telephone line of the detection of various states, only the transmitter can be detected, such as determining TIP or PING line, to determine the work of the telephone line