1. Widely used in metal wire line occasions such as telephone system, computer network, video network, optical communication engineering and so on. 2. Adopt LCD intuitive display screen, data display is clearer, POE mode, digital mode, analog mode can be switched freely. 3. POE test function: This tool can be used to test standard and non-standard POE equipment, as well as POE voltage, power supply polarity and power supply mode. 4. Voltage test function: You can click "V" to enter the voltage test function, you can measure the battery voltage and voltage polarity, and then press "V" to enter the test mode. 5. Adjustable sensitivity: when you receive a strong signal, turn down the stereo; when you receive a weak signal, please pick up the audio equipment, it can give you more accurate test data. 6. With the LED flashlight function, the flashlight can be turned on when the light is weak or used at night, so that you can use it normally in the dark environment. parameter: 1. Material: ABS 2. Power supply: Transmitter: 3 AA batteries (not included) Receiver: 9V (not included) 3. Analog cable trace: yes 4. Digitized Cable Tracing: Yes 5. Tracking cable that supports PoE: Yes 6. Identify cable pairs and connection quality: yes 7. Battery Voltage Polarity Check: Yes 8. Battery voltage measurement (for reference only): Yes 9. PoE voltage polarity check: yes 10. PoE voltage measurement (for reference only): Yes 11. Check breakpoints: yes 12. Continuity Test: Yes 13. Trace signal transmission distance: 3Km 14. Output signal level: ~ 15Vp-p 15. Vibration indication: ET613 only 16. Flashlight: Yes 17. Adjustable volume: yes 18. Low battery indicator: yes Packing list: 1 x Transmitter 1 x Receiver 3 x wires