Features:1. Measure network cable length and determine the distance of open and short circuit. 2. Check wiring error in 5E, 6E, coaxial cable, such as open circuit,short circuit, jumper wire, reverse connection . 3. With 8 remote identifiers , more easy to work. 4. Portable unit with long battery life (wait-case 50 hours). 5. Automatically time-delay shut off. 6. Self-checking and automatically compensate any change in battery capacity or ambient temperature. Technical indexes:NF8108-M Transmitter specificationsIndictorLCD 53x25 mmTone frequency225 HzMax. distance of cable map300mMax. working currentLess than 70mACompatible connectorsRJ45Faults LCD displayLCD displayLow battery displayLCD ( 6.5V)Voltage protectionAC 60V/DC 42VBattery TypeDC 4x1.5vDimension(LxWxD)184x84x46mmNF8108-M Remote unit specificationsCompatible connectorsRJ45Remote units8Dimension(LxWxD)78x33x22mmAttention: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.Package Include:1 X transmitter( battery is not include )8 X remote