Small in size but powerful in function - the S17 personal voice amplifier is a compact and lightweight solution for clear voice amplification. With a 30-watt output power, it effectively amplifies your voice, helping to protect your vocal cords and ensuring you can be easily heard by 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 and convenient using the included USB cable, with a full charge taking approximately 3 to 5 hours. Comfortable and portable - Designed for ease of use, the amplifier comes with an adjustable strap that can be worn around the waist or neck. A built-in clip on the back allows secure attachment to a belt or waistband. The wired microphone features an adjustable gooseneck design for optimal positioning near the mouth. Reliable performance - This voice amplifier delivers consistent audio quality and is ideal for various speaking applications. Suitable for teaching, coaching, singing, tour guiding, public speaking, yoga instruction, outdoor events, shopping malls, and more. Dimensions: 8.4 x 9.2 x 2.8 cm