It employs a high-quality VCA (Voltage Controlled Amplifier) and an RMS (Rough Mean Squared) type sensor. This is a professional-grade compressor that delivers low noise and a natural attack response. The power supply unit is equipped with a DC-DC converter circuit. By boosting the internal voltage to 18V (±9V), a high dynamic range is achieved, ensuring ample headroom and resistance to distortion. Equipped with a REDUCTION indicator. You can visually see the level of compression/limiting applied based on the dynamics of your picking. It employs TBS (True Bypass Switching) using 4PDT switches. When bypassed, the signal does not pass through any electronic circuitry, resulting in a complete bypass state. Battery replacement is a one-touch operation. It can be easily replaced without using a screwdriver or coin. Purely made in JapanCondition: No problems with use Power supply: 9V center negative or 9V battery Accessories: Box, instruction manual Warranty: 3 months for initial defects only