[Small but very powerful] -- This personal voice amplifier is compact and lightweight, making it ideal for everyday use. The portable microphone speaker delivers 30 watts of output power, effectively amplifying your voice and reducing strain on your vocal cords. It can clearly project your voice to an audience of 25 to 100 people. [Long Battery Life] -- The voice amplifier features a 2200mAh high-capacity rechargeable lithium-ion battery, providing up to 12 hours of continuous use on a full charge. It charges easily via the included USB cable and takes approximately 3 to 5 hours to fully charge. [Convenient and Portable] -- Designed for ease of use, the portable speaker comes with an adjustable strap that can be worn around the waist or neck. It also includes a back clip for attaching to a belt or waistband. The wired headset microphone has an adjustable gooseneck design for optimal positioning near the mouth. [Stable Performance] -- This voice amplifier offers reliable and consistent performance. The wearable headset microphone ensures clear sound pickup, making it ideal for various speaking situations. Suitable for teachers, coaches, instructors, tour guides, fitness trainers, presenters, and public speakers in settings such as classrooms, gyms, shopping malls, outdoor events, and tours. Size: 8.4 x 9.2 x 2.8cm