[Small but very powerful] -- If you want to buy a personal voice amplifier that is small and light, then S17 is for you. It is a portable microphone speaker with 30 watts of output power, which can boost your voice significantly and protect your vocal cords, so you can easily let your voice be heard by 25 to 100 people. [ Lone Battery Life] -- The small voice amplifier comes with a 2200mAh high-capacity rechargeable lithium-ion battery that provides up to 12 hours of operation on a fully charged battery. Charging is easy with a supplied USB cable. And it only takes 3-5 hours to fully charge. [Convenient and Portable] -- The portable speaker comes with an adjustable strap that you can tie around your waist or hang around your neck. The teacher speaker amplifier has a clip on the back, you can clip it on a belt or waistband. The wired headset microphone is adjustable. [Stable performance] -- It is an original voice amplifier with stable performance. The wearable headset microphone is a flexible gooseneck design that is positioned right near your mouth. Great for anyone doing events who need to project their voice. Suitable for teaching, coach, singer, trainer, tour guide, shopping mall, presentation, yoga, outdoor speech, etc. Size: 8.4 x 9.2 x 2.8cm Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!