More Information Easy to use controls and easy to return to settings.    Controls all operate very smoothly.   Will provide full bypass function when unit is switched off.   Plugs into any speaker/headphone jack. You may need an adapter plug/jack to fit yours.  Any Speaker or head phone can then plug directly into QF-1A.  Again, an adapter plug may be needed.  The QF-1A uses a 1/4" phone plug and jack for In and Out respectively.  Has built-in speaker and headphone amplifier and will adapt accordingly to whatever you plug in. Download User Manual