Happyfun Network Cable Tester, RJ45 RJ11 Multi-Function Wire Tracer and Circuit Tester with Earphone for Cable Collation Digital Battery Tester

MULTI-FUNCTION CABLE TESTER NETWORKING TOOL - Quickly find breaks without damaging the wire's outer skin. When connecting to the alligator clip, the cable tester can trace not only Ethernet LAN wires, but also electrical and speaker wires. Note: The wires must be powered-off when performing this search. EASY TO OPERATE - There are only 2 buttons on the transmitter, "Function Select" and "Function Switch" and 1 button "Push to Test" on the receiver. Indicators such as "SCAN" and "TEST" are easy to identify. WIRE TRACKING - Wire Tracking: Connect the wires to the transmitter via alligator clips. Select "Scan". If the "STATUS" light is ON, the transmitter is operational. Use the receiver to find the target wire. No additional testers are required. NETWORK LINE TEST - Network Line Test: Plug one side of the cable into the transmitter and the other side into the receiver. Select "Test" and if the "VERIFY" light is ON, the transmitter is functioning properly. Identify circuit problem within a large number of cables. DESIGNED WITH EARPHONES - Using the earphones, you can get clear information in noisy environments, and adjust the volume knob for proper volume to avoid interference.