Soundbrenner Core, 4-in-1 Smart Music Tool integrated in a watch; 4 functions: Watch, Vibrating Silent Metronome, Magnetic Tuner & Decibel Meter; always have your tools with you, whether you're practicing at home, recording in the studio, or even performing on stage; Sync the Metronomes for up to 5 Players simultaneously, Tap Tempo function, DAW Intergration, Setlist mangement & storage; MIDI Controller; Backing Track Sync; Date & Time Display, Push Notifications, Stopwatch & Timer; Interchangeable Watch Straps, included: Soundbrenner Core, Grey Sillicone strap, charging cable, magnetic tuner mount, Body strap, Ear plugs