5 tuning modes for option: chromatic, guitar, bass, violin, ukulele, suitable for a wide variety of instruments. One button operation, just press the power button to turn on/off the tuner and choose the tuning mode you want. Clip-on tuner design, easy to install, just clip it on the strongest vibrating part of your instrument to use. Small size and light weight, easy for storage and carrying it all around, enjoy music whenever and wherever. Button battery power supply, automatically shut off after 5 minutes of inactivity. (Button battery is not included) Different colour variations for flat notes and sharp notes for better visualisation in low light.