The IMT-301 combines five functions in a single unit. First, it is an extremely precise 12 note even tempered digital chromatic and guitar tuner that works with virtually all instruments and voice. When used as a metronome, the IMT-301 delivers 30 to 250 beats per minute in 40 steps. It features a total of three tones: strong beat (chimes), weak beat (drum) and rhythm (wood block). Also a built-in thermometer and hygrometer. Battery included. Also it includes a black protective cover.