This is ABYBOX, a handmade brand! It works without any problems! No box or manual included! SIZE / WEIGHT 93×39×32mm / 146g A compact and simple metal effector with A/B switching function. - Brand: LAGOON SOUND - Model: B-A IN - Connectors: A/B, B-OUT, IN - Size: Compact - Design: Metal, simple design Thank you for looking.