Features: 1. Directly hunt 5E, 6E, telephone wire, coaxial cable, USB cable and other cables. 2. Hub blink for locating network port by the flashing port light on Hub / Switch. 3. Check wiring error in 5E, 6E, coaxial cable, such as open circuit,short circuit, jumper wire, reverse connection. 4. Locate the wiring or connection error. 5. Measure cable length up to 1000m and locate the breakage point. 6. polarity test function measure DC voltage (0.5-60 V). 7. Memory and storage for calibration data. 8. Automatically time-delay shut off and Low battery alarm function. 9. With 8 remote identifiers , more easy to work. Technical indexes: NF-388 Transmitter specifications IndictorLCD 53x25 mm, with back light Tone frequency225kHz Max. distance of transmission2 km Max. distance of cable map1 km Max. working currentLess than 70mA Tone mode2 Tones adjustable Compatible connectorsRJ11RJ45, BNC, USB Function and faults LCD displayLCD display ( wiremap, Tone, short, , No adapter, Low battery ) Cable map indicationLCD (#1-#8) Shielded indicationLCD ( #9) Voltage protectionAC 60V/DC 42V Battery TypeDC9.0VNEDA 1604/6F22 DC9V x 1pcs Dimension(LxWxD)185x80x32mm NF-388 Receiver specifications Frequency225kHz The Max. working currentLess than 70mA Earjack1 LED illumination2 Battery TypeDC9.0VNEDA 1604/6F22 DC9V) x1pc Dimension(LxWxD)218x46x29 mm NF-388 Remote unit specifications Compatible connectorsRJ45, BNC Remote units8 Dimension(LxWxD)107x30x24mm Attention: 1.Don't connected high voltage lines to avoid buring out the machine. 2.Put into the right place to avoid hurting others,because of the sharp part. 3.Connected the cable to the right port. 4.Read the user manual before use it.