Great tuning pedal for the home or studio! Very accurate and easy to read, the TU-12 can be plugged in via 1/4" input jack. Moreover, the TU-12 also has a built in condenser microphone for accurate tuning of acoustic instruments. It has an output as well, so you can leave it connected to your pedal board. Powered via a 9 volt power supply, this TU-12 is in good condition and functions as it should.