Fangrui Product Details Optimal Voice Amplification: Experience Crystal-clear Sound With Shidus Mini Voice Amplifier, Designed Specifically For Teachers, Tour Guides, And Fitness Instructors. Its Powerful Audio Projection Makes It For Outdoor And Indoor Activities. Bluetooth Connectivity: Easily Pair With Any Bluetooth-enabled Device To Stream Music Or Amplify Your Voice. This Versatile Amplifier Also Serves As A Portable Speaker. Comfortable Headset Microphone: Includes A Lightweight, Adjustable Headset Microphone That Comfortably Fits And Provides Excellent Sound Quality, Ensuring Your Voice Is Heard Clearly Without Strain. Portable And Lightweight: The Compact Design Makes It Easy To Carry Around, Fitting Into Any Bag Or Even A Pocket, Making It An Ideal Choice For Dynamic And Mobile Teaching Or Presentations. Durable Battery Life: Equipped With A Long-lasting Battery, It Provides Extended Use Without The Need For Frequent Recharging, Supporting Your Speaking Engagements Throughout The Day. Battery: 3.7v 1800ma Batt