Mugig Chromatic Guitar Tuner Pedal True Bypass for Guitar / Bass - This is a cool pedal tuner. This pedal does not accept batteries so you need to buy a 9V power supply to power this pedal. It is a sturdy pedal, encased in metal with a metal button on top along with flat and pitch buttons. There is an input port (to guitar) on one side of the pedal and an output (to amp).on the other side. The display is bright and clear and easily readable. Provides accurate tuning. This is a great value for the quality of this pedal, I would highly recommend. #RankBoosterReview #Sponsored #Mugig https://www.amazon.com/Mugig-Chromatic-Guitar-Connectable-Interface/dp/B075L8JCC1