Small but very powerful If you are looking for a personal voice amplifier that is small and lightweight, then S17 is the right choice. It is a portable microphone speaker with30 watts of output power, which can clearly amplify your voice and protect your vocal cords, allowing you to easily make your voice heard by 25 to 100 people.Long Battery Life The small voice amplifier has a highcapacity 2200mAh lithiumion battery that provides up to 12 hours of operation from a fully charged battery. Charging is easy via the included USB cable. And it only takes35 hours to fully charge.Convenient and Portable ① Portable speaker comes with an adjustable strap that you can use to tie around your waist or hang around your neck. ② The teacher speaker amplifier has a clip on the back, you can attach it to a belt or the waistband of your pants. ③ TheThe wireless headset microphone is adjustable.Stable PerformanceIt is an original voice amplifier with stable performance. The wireless headset microphone is a fleible gooseneck design that is placed directly near the mouth. Perfect for anyone who does events and needs to project their voice.Suitable for teaching, trainer, singer, coach, tour guide, shopping mall, presentation, yoga, outdoor speech and etc.Size 8.49.22.8CM