Used for about 1-2 years. No operational problems. The Archer is an effects pedal designed by J. Rockett Audio Designs, who OEM-produced the "KTR," the successor to the legendary overdrive pedal Centaur. The Archer Ikon uses Russian diodes similar to the original Centaur, faithfully reproducing the sound of the gold enclosure era. Specifications ■ Guitar Effects Pedal ■ Overdrive, Booster ■ Buffered Switching ■ Power: 9VDC adapter (center negative) / sold separately