3.5mm Portable Voice Amplifier With Microphone Headset 12W 7.5V 2000mAh Lithium Batteries Rechargeable lithium batteries that last 6-8 hours of continuous use before needing a charge Battery life will last 2-3 years Sound covers over 3,500 square feet Can be worn inside a costume in many different ways Can also be used MP3 speaker. The amp has a microphone input and a MP3 input . The amp will accept signals from both input ports and out through the speaker at the same time