Best Brass e-Sax Mute Tenor Sax is a device that allows saxophone players to practice their instrument quietly without disturbing others. It reduces the sound output to a whisper at approximately -25dB using an acoustic lining material that absorbs much of the sound. The natural sound can be enjoyed through the included headphones, allowing you to perform on your own or with backing tracks and play-along CDs. Additionally, the supplied cable facilitates interactions with PCs, MP3 players, or recording devices, enabling you to record your performances or connect to recording software.