1Can be used for: telecommunication engineer,wiring engineer and network maintenance engineer,etc. 2Suitable for directly hunting for cables with RJ45 connectors,telephone wires with RJ11 connectors. 3Cable sorting is a process of detecting physical connections in a cable like open circuit,short circuit,wrong circuit and reversed circuit. 4Use the emitter to detect line level or positive and negative electrode. 5Two ways to detect connected states of circuits.Features: Can be used for: telecommunication engineer,wiring engineer and network maintenance engineer,etc. Suitable for directly hunting for cables with RJ45 connectors,telephone wires with RJ11 connectors. Cable sorting is a process of detecting physical connections in a cable like open circuit,short circuit,wrong circuit and reversed circuit. Use the emitter to detect line level or positive and negative electrode. Two ways to detect connected states of circuits. Specifications: Work Temperature:0~40,the maximum 80% relatively humidity (no coagulation) Storage Temperature:-10~50,the maximum 80% relatively humidity (no coagulation,no battery) Elevation: 2000 meters Type of Anti-explosion: IP 40 Distance of Sending Signal: 3000 meters Battery: 3x1.5V/AAA (Emitter),1x6F22/9V (Receiver)(Battery not included) Item Color: Green RJ45 Cable Length:16.8cm/6.6in Weight: Approx.360g/12.7oz Package list: 1 * Emitter (Battery is not included.)1 * Receiver (Battery is not included.) 1 * crocodile clip test line 1 * user manual 1 * RJ45 cable (random color) 1 * cloth pouch 1 * Earphone