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 .