BOSS Heavy Metal HM-2 Effects Pedal for a Variety of Tones - Model: Heavy Metal HM-2 - Brand: BOSS - Control Knobs: LEVEL, COLOR MIX, DIST. - AC Adapter: BOSS AC ADAPTOR (PSA compatible) - Input/Output: INPUT, OUTPUT Thank you for viewing. Please be sure to read the profile before purchasing and agree to the terms before proceeding with the purchase. This is a Japanese-made Heavy Metal pedal from 1985. The indicator LED has been changed from red to blue. The power adapter has been modified to bypass the ACA adapter and is now compatible with a PSA adapter, so it cannot be used with an ACA adapter. Although it is not in its original condition, it is recommended for those who want to use it actively. It works normally with a PSA adapter and a regular power supply. It also works fine with batteries. There are no modifications related to the sound. You can get heavy metal sounds, shoegaze sounds with all knobs in the center, and death metal sounds with all knobs at full. Recommended for those who find the distortion of DS-1 and DS-2 insufficient, but find the Metal Zone a bit much. This is a legendary piece of gear!