The CBT-500 Cable Tester by Hosa Technology diagnoses signal failure in cables terminated with any combination of XLR, Phone, Phono, and speakON® connectors, as well as DIN, Ethernet, and USB Type A to Type B cables. It is also equipped with removable leads to verify continuity of additional connectors and jacks. Operation requires one 9-volt battery (included).FunctionsCable Test: Turn knob to position 1 Plug one connector into corresponding jack on left side of tester Plug other connector into