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