The Barcus-Berry Model 3000A Preamp/Eq Buffer is a high-quality audio device designed for use with violins. Made in the USA, this preamp/equalizer provides superior sound quality and performance. The green color adds a unique and stylish touch to this essential musical instrument accessory. Perfect for musicians looking to enhance their violin's sound output, this Barcus-Berry preamp/equalizer is a reliable and top-notch option for achieving optimal audio performance.