Voice amplifiers are a great way to be heard and to get attention, they can be used by teachers, instructors, tour guides and in a multitude of other professions. Buying the right amplifier can help you be excel at your job. The 15W S278 portable voice amplifier is a great microphone and speaker system for easy announcements, communication or teaching. Make yourself be heard without straining or even permanently damaging your vocal cords, a convenient and indispensable tool for classroom teachers, public speakers, fitness instructors, coaches, tour guides and more. It captures the clear, smooth and crisp sound in front of the microphone and suppresses unwanted background noise. Since the microphone is unidirectional, for better and clearer pickup, please keep your lips 45 degrees in front of the microphone within 1~2 Inches. S278 personal voice amplifier is lightweight ( only 0.44 lbs ） and small. It comes with a adjustable waistband which makes voice amplifier easy to carry. Easy to Setup & Use -- Plug and play,with the range in the volume control,you can easily adjust the volume. Portable Microphone -- The wired headworn microphone is rotatable and adjustable. You can adjust the distance between your mouth and the mic. Never Be Unheard Again S278 voice amplifier can be used for a presentation in a small/ medium room to a group of 20 to 65 people. Compact and Portable Compact, Lightweight and Stylish Design. Made of durable and wear-resistant ABS material, this portable voice amplifier looks fashion. Long Battery Life You can use the small voice amplifier for up to 12 hours (MIC mode), 6 to 8 hours (musical mode) with a fully charged battery. And it only takes 3-5 hours to fully charge. Can be worked as a external/Bluetooth speaker You can play the music through the USB port; SD card & AUX input (e.g. mp3, CD player), or stream your favorite music from your any type of Bluetooth-enabled mobile devices like smartphone,Tablet and more, up to 32 feet away. One-key recording. Easily record meetings , lectures and more. You won't miss any important messages again! Please make sure the TF card/USB Disk and wired microphone are inserted before the recording. ( Noted: TF Card & U Disk are not included in the package ) FM Radio You can listen to your favorite radio stations right through the voice amplifier Specifications: Power output: 15W Charging: DC 5V, 500mA Charging time: 3-5 hours Working time: 8-12 hours( microphone mode ), 6-8 hours( music mode ) Size: 4.5 x 3.5 x 1.3 in Weight: 0.44lbs What's in the package: 1 * voice amplifier 1 * wired headset microphone 1 * USB charging cable 1 * waistband 1 * AUX cable ; 1 * user manual Not Charger included ( You can plug the included USB cable into your computer, wall charger or any 5V power bank to charge the voice amplifier) USING TIPS: 1. Keep microphone right in front of the mouth for maximum amplification. 2. NO HOWLING: the microphone and speaker need to be positioned a distance from each other, and are best facing away from each other. Feedback may also be caused if the volume setting is too high. The best way is to put on the microphone headset, hang the amplifier speaker around your waist, then turn it on, and finally gradually increase the volume as needed. 3. How do I turn off Bluetooth? Because Bluetooth is turned on by default. After you turn it on, please short press the M key to switch the mode to power mode to turn off the Bluetooth.