[Small but very powerful] -- If you are looking for a personal voice amplifier that is small and light, then the S17 is the right choice. It is a portable microphone speaker with \n 30 watts of output power, which can clearly amplify your voice and protect your vocal cords, so you can easily make your voice heard by 25 to 100 people. \ n [Long Battery Life] -- The small voice amplifier has a high-capacity 2200mAh lithium-ion battery that provides up to 12 hours of operation from a fully charged battery. Charging is easy via an included USB cable. And it only takes \n 3-5 hours to fully charge. \n [Convenient and Portable] -- Portable speaker comes with an adjustable strap that you can use for to tie around the waist or hang around the neck. The teacher speaker amplifier has a clip on the back, you can attach to a belt or trouser waistband. The \n wireless headset microphone is adjustable. \n [Stable performance] -- It is an original voice amplifier with stable performance. The wireless headset microphone is a flexible gooseneck design that is placed directly near the mouth. Perfect for anyone who does events and needs to project their voice. \n Suitable for teaching, trainer, singer, coach, tour guide, shopping mall, presentation, yoga, outdoor speech and etc. \n< p>size8.4*9.2*2.8CM Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store