This Mackie MTest-1 Cable Tester is perfect for musicians, sound engineers, and anyone working in live sound or studio settings. It helps you quickly and easily test cables without the hassle of guessing. Whether you're on stage or in the studio, this tester is a reliable tool. The tester comes with a simple 5-way switch for testing pins and can even handle mismatched connectors. It's powered by a single 9v battery. It features commonly used connector types such as TRS, TS, XLR, RCA, Speakon, 3.5mm TRS, MIDI, and Banana jacks. With its built-like-a-tank construction, it's durable and ready for any gig.