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 specifications IndictorLCD 53x25 mm Tone frequency225 Hz Max. distance of cable map300m Max. working currentLess than 70mA Compatible connectorsRJ45 Faults LCD displayLCD display Low battery displayLCD ( 6.5V) Voltage protectionAC 60V/DC 42V Battery TypeDC 4x1.5v Dimension(LxWxD)184x84x46mm NF8108-M Remote unit specifications Compatible connectorsRJ45 Remote units8 Dimension(LxWxD)78x33x22mm 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. Package Include: 1 X transmitter( battery is not include ) 8 X remote