Rechargeable lithium batteries that last 10 hours of continuous use before needing a charge. A Green LED Light will indicate that battery is fully charged * Very loud, excellent clarity, low feedback. Sound covers over 4,300 square feet (400 Square Meters) * Small & Portable Super Powerful Voice Amplifier/Speaker. Size is 4.13in x 3.31in x 1.38in (105mm x 84mm x 35mm) * Comes with adjustable waist or neck band and a removable belt clip * Comes with Headset microphone, Charger cable, MP3 cable, MP3 line in port, Microphone line in port