It is the world's smallest guitar pedal tuner, taking up half the space as a typical small pedal and a quarter of the space of a standard electric guitar tuning pedal. Made of strong classic aircraft aluminum, with clear high contrast HD display. You can mute the tuner without cutting off the flowing signal when using it. There is no loss of tone or unpleasant "pop" noises. Simply clean, quiet and precise tuning. Bright LED strobe lights allow you to easily tune any lighting, whether it's a dark indoor stage or a bright outdoor festival. With steel ring protection and HD screen, you will never have to worry about damage to the tuner and screen. High tuning accuracy, Lightning fast response provides accurate tuning with an accuracy of ±1 cent. It makes operation very easy. (Power supply not included)