Hosa CBT-500 Audio Cable TesterThe 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). Cable Test: Turn knob to position 1 Plug one connector into corresponding jack on left side