[Small but very powerful] -- The S17 is a compact and lightweight personal voice amplifier designed for portability without compromising performance. With 30 watts of output power, this portable microphone speaker significantly amplifies your voice and helps protect your vocal cords, making it easy to be heard by groups of 25 to 100 people. [Long Battery Life] -- Equipped with a 2200mAh high-capacity rechargeable lithium-ion battery, the voice amplifier provides up to 12 hours of continuous use on a full charge. It charges quickly and conveniently via the included USB cable, reaching full charge in 3 to 5 hours. [Convenient and Portable] -- Designed for ease of use, the portable speaker features an adjustable strap for wearing around the waist or neck. It also includes a back-mounted clip for secure attachment to a belt or waistband. The wired headset microphone offers flexible positioning with an adjustable gooseneck design. [Stable Performance] -- This voice amplifier delivers reliable and consistent audio performance. The wearable headset microphone positions close to the mouth for clear sound projection, making it ideal for teaching, coaching, training, touring, presentations, yoga instruction, outdoor speaking, and other voice-intensive activities. Size: 8.4 x 9.2 x 2.8 cm