Convenient chromatic tuner you can easily take with you! You can input the sound of your instrument into the built-in microphone, and the auto-tuning function will automatically help you tune within the range of A0 to C8. The key ring itself is of course included. Includes the note name and the deviation from pitch in an easy-to-read display.Simply, press power switch to turn on/off.Input sound of instrument into built-in microphone, plus key ring includedIndicates name of note and deviation in cent.Chromatic tuning range of A0～C8Auto Power-off / 2min. without sensing a note