Small and powerful personal voice amplifier: The S17 is a compact, lightweight portable microphone speaker with 30 watts of output power, designed to amplify your voice clearly and protect your vocal cords. Ideal for addressing groups of 25 to 100 people. Long-lasting battery: Equipped with a high-capacity 2200mAh rechargeable lithium-ion battery, it provides up to 12 hours of continuous use on a full charge. Charges quickly and conveniently via the included USB cable in 3 to 5 hours. Portable and comfortable design: Features an adjustable strap for waist or neck wear. Includes a back clip for secure attachment to belts or waistbands. The wired headset microphone has an adjustable gooseneck for optimal positioning close to the mouth. Reliable performance: Offers stable audio amplification with a flexible gooseneck microphone. Suitable for teaching, coaching, singing, training, tour guiding, presentations, yoga instruction, outdoor speaking, and retail environments. Compact size: 8.4 x 9.2 x 2.8 cm.