The Cherub Metronome Tuner WMT-555C is combination metronome, chromatic tuner, & tone generator:Features:Small, portable design lets you take it anywhere! Will fit in a shirt pocket. Metronome has one of the loudest beep... volume control will let you turn the sound down or off and you can view the 3 led lightsVolume control lets you turn off click or voice and you can view a large flashing vertical, red led light.As the tempo is raised or lowered the tempo scope (largo - prestissimo) is displayed. Auto off function turns the unit off of 5 minutes of no signal detection or metronome use.Earphone and tuning pick up included or use the built in microphone - will tune all instruments.Tuner will let you tune by the key of your instrument C, F, Bb,Eb but will tune all instruments. Easy-to-see large screen. Flip out metal stand.Pitch Generator generates A 440. Uses 2 AAA batteries included. Weight 3 oz.Dimensions: 4"w x 2 1/2"h x 1/2"d. Instructions included.