Purchased around 1990, comes with the box and instruction manual. Used for about a year when I was in my second year of junior high school, approximately 35 years ago, and has been stored in a box at home since then. 【Product Overview】 The BOSS CS-3 Compressor/Sustainer is an essential item for improving the sound quality of guitars and basses. It enhances the dynamics of the sound and strengthens the sustain, adding depth to your performance. 【Control Functions】 The four control knobs, LEVEL, TONE, ATTACK, and SUSTAIN, allow for fine-tuning of the tone and dynamics. This enables you to achieve the optimal sound for your playing style and the song. 【Power Specifications】 Operates on a 9V battery, making it convenient for portability. It is designed for optimal use in live performances and studio settings. - Brand: BOSS - Model Name: CS-3 - Type: Compressor/Sustainer - Controls: LEVEL, TONE, ATTACK, SUSTAIN - Power: 9V battery - Input Terminals: INPUT - Output Terminals: OUTPUT Thank you for viewing. #BOSS #Boss #Guitar #EffectsPedal