[Small but very powerful] -- This personal voice amplifier is compact and lightweight, making it ideal for portable use. The S17 is a portable microphone speaker with 30 watts of output power, effectively amplifying your voice and helping to protect your vocal cords. It allows your voice to be clearly heard by groups 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. Charging is simple with the included USB cable, and the unit recharges fully in 3 to 5 hours. [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 secure attachment to a belt or waistband. The wired headset microphone is adjustable for optimal positioning. [Stable Performance] -- This voice amplifier delivers reliable and consistent performance. The wearable headset microphone has a flexible gooseneck design that positions close to the mouth for clear sound projection. Ideal for teaching, coaching, singing, training, tour guiding, presentations, yoga instruction, outdoor speaking, and other voice-intensive activities. Size: 8.4 x 9.2 x 2.8cm