Portable Amplifier. Don't raise your voice! It's easy to project your words with the powerful, lightweight amplifier that snaps around your waist for "hands-free" public speaking. Just fasten the adjustable waistband amplifier to your waist, put on the headset microphone, and start talking! Use it indoors or out - at meetings, school programs, sporting events, field trips, assemblies, lunch and playground duty, and more. Perfect for teachers, administrators, aides,and students. The rechargeable battery delivers approximately 8 hours of Loud and Clear amplification.