Ivation Portable Voice Amplifier with Waist/Neck Band Strap and Belt Clip - Great for Teachers, Tour Guides, Shows, Presentations Etc. - Rechargeable Lithium Battery Ultra Lightweight and Portable - Size 3.5 x 3.75 x 1.25, Weighs 8 oz. Powerful output covers an area over 4,000 sq. ft. High-tech digital circuit technology and SMT for utmost sound Clarity Can also be used as MP3 Music Speaker via input jack - Includes 3.5mm Male to Male AUX Cable Built-in rechargeable & replaceable high-capacity battery - Works continuously for 16 hours