beltbox: vocal dampener for singers, actors, performers, stress relief. a portable warm-up room. beltbox this portable vocal dampening device allows performers to warm-up to full voice without disturbing those around them. beltbox can quiet a performer up to 30 decibels while still being able to hear their intonation. the included hands-free strap allows the user to practice choreography or an instrument. beltbox is water-proof for easy cleaning and use in the shower! includes carrying bag. recommended for ages 13+. asin: b01frk4mla