Since the Pitchjack has a built-in jack, simply plug it directly into your guitar or bass, turn on the power, and you're ready to tune. It's a must-have item for every guitarist and bassist. You can adjust the viewing angle of the Pitchjack's display to compensate for your instrument's body shape or the angle of its output jack. Use the Pitchjack on the street, in your rehearsal space, when you've changed strings in the studio, or when you've picked up your instrument in your bedroom giving you the ability to play in tune at any time.