This is the TC Electronic "Spark Mini Booster," a simple and easy-to-use clean booster. It can boost up to +20dB, and can be used to emphasize the sound's presence by placing it before a crunch or fuzz effect, or to increase the volume for solos. It naturally boosts the original sound without damaging it, making it ideal for those who want to improve their sound's clarity or want to keep it on their board permanently. Operation has been confirmed, and there are no issues such as scratchiness or noise. The appearance is also relatively clean, but the original box is not included. It will be carefully packaged and shipped. Immediate purchase and silent purchase are welcome. 20dB mini booster using analog circuitry. - Model Name: SPARK - Brand: tc electronic - Function: Mini Booster - Circuit: Analog - Bypass: TRUE BYPASS - Output Level: 20dB Thank you for viewing.