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). Functions Cable Test: • Turn knob to position 1 • Plug one connector into corresponding jack on left side of tester • Plug other connector into corresponding jack on right side of tester • Turn knob to each position to check wiring of each contact Continuity Test: • Apply the tip of each lead to the corresponding contacts • If continuity exists the center LED will illuminate and tester will beep Battery Check: • Turn knob to Battery Check • LED will illuminate if the battery is charged