KNA UP-1 ピエゾピックアップの高価買取価格

It seems like you're referring to a product, specifically the KNA UP-1 Universal Piezo Pickup. This type of pickup is commonly used for amplifying acoustic instruments. The KNA UP-1 can be attached to various string instruments, such as guitars, violins, or mandolins, allowing for a more natural sound when amplified.
If you have specific questions about the product, need information on its features, installation, or use, please let me know!