The "PREMIUM DRIVE III" uses a quad op-amp to create a thicker sound with emphasized midrange. You can deeply appreciate the classic sound. You're sure to be captivated by the rich, lustrous sound, especially when playing single notes! By developing a new "Presence" function, it becomes possible to manipulate the higher frequencies above Hi. It delivers a range of sounds, from thick, warm distortion to sharp, edgy tones. It's also possible to transform the harsh, edgy sound of Marshall and JC amps into a thicker, milder, and easier-to-play sound. We repeatedly conducted actual hardware tests on "PREMIUM DRIVE II," which we had been developing 14 years ago. By tuning without any compromise, we achieved a pure and transparent sound. Through carefully selected parts and precise hand-assembly, we guarantee an extremely consistent sound quality that cannot be achieved with mass-produced products! Compatible power supply: 9V adapter or 9V battery