THE VERSATILE AND PROFESSIONAL DR. BEAT Practice in style with the flagship of the Dr Beat Metronome line, the BOSS Dr Beat Metronome - DB90 is loaded with quality sounds and drum patterns to make your practice sessions less mundane and more musical. There’s a Rhythm Coach function with an onboard mic, a reference-tone function for tuning, an Instrument input, MIDI input, and other handy tools to make learning fun and effective. Product Features Quick rhythm customizing with Note Mixing function, dozens of play-along drum patterns also built in Dedicated sliders, buttons, rotary dial, and large backlit LCD for user-friendly operation 4 metronome (including human voice) sounds Reference Tone function makes it easy to verify tuning by ear Practice with the Rhythm Coach by connecting a V-Pad (optional) — rubber pads and acoustic drums can also be detected via built-in mic Direct connection with guitar and bass, plus headphone monitoring Footswitch control for hands-free play/stop, and MIDI input for sync to external sequencers