This is the "Baby Master" by Shin's Music, a compact and easy-to-use device. It's a passive volume controller that connects to an amplifier's send/return or effects loop, allowing you to control the volume without significantly altering the sound quality. It's perfect for home practice and low-volume environments, as it allows you to reduce the volume while maintaining the distortion and nuances of a tube amplifier. Its small size and simple, power-free operation are also appealing. 【Condition】 ・Functionality confirmed ・Minor scratches from use (see photos) ・No crackling, in good working order 【Included Items】 ・Main unit only This is a compact yet highly practical piece of equipment. If you're looking for one, please consider it.