1. We use only through hole parts to get the best sound quality. Top parts are used (polyester caps, 1% metal film resistors, ...). 2. All our pedals are True Bypass: your tone won't be compromised when the pedal is switched off! 3. High quality PCB making and soldering, inside a robust aluminium enclosure (size 1590B, 116mm x 60mm x 39mm) 4. The pedal runs on a 9V battery, and on any negative 9V power supply.