Small in size but powerful in function - the S17 is a compact and lightweight personal voice amplifier designed for clear voice projection. With a 30-watt output power, it effectively amplifies your voice, helping to protect your vocal cords and making it easily audible to groups of 25 to 100 people. Long battery life - Equipped with a high-capacity 2200mAh rechargeable lithium-ion battery, this voice amplifier provides up to 12 hours of continuous use on a full charge. Charging is simple via the included USB cable, with a full charge taking approximately 3 to 5 hours. Comfortable and portable - The unit comes with an adjustable strap for waist or neck wear, and features a back clip that allows secure attachment to belts or waistbands. The wired headset microphone has an adjustable gooseneck design for optimal positioning near the mouth. Stable performance - This voice amplifier offers reliable operation and is suitable for various speaking applications. Ideal for teaching, coaching, singing, guided tours, public speaking, yoga instruction, outdoor events, shopping malls, and more. Dimensions: 8.4 x 9.2 x 2.8 cm