High-quality sound compression effect. - Model Name: CS-3 - Type: Compression Sustainer - Color: Blue - Power: 9V battery or AC adapter (batteries removed) - Output Terminals: OUTPUT - Input Terminals: INPUT Thank you for viewing. This is a relatively old model made in Taiwan. Since it's Taiwanese-made, the circuit board doesn't use surface-mount technology, making modifications easier. I used this for a while after purchasing it used, so there are many scratches and stains. Please consider this condition when purchasing. #boss #Roland #compressor #guitar #electricguitar #acousticguitar #bass #musicalinstruments #guitareffects