Simple yet handy six-string, tune-by-ear guitar tuner. - Includes a metronome. - Create and save your own tunings. - Delivered tunings: Standard, Double Drop D, Drop C, Drop C#, Drop D, Full Step Down, Half Step Down, Open A, Open C, and Open D. - Saves your last tuning selection. - 'Repeat' option, three-position checkbox. Click once to play indefinitely. Click again to play for 8 seconds.