Small & Lightweight If you are looking to purchase a personal voice amplifier that is small in size and lightweight, then this S511 portable microphone is what you need. Super 15W Output The sound is clear, crisp, no noise and no distortion. The max 15 watts sound can cover about 10000 sq.ft (1000 ㎡), loud enough to cover a big room.Can be used for group of 50-150 people. Portable & Easy to Use 1. Operation is straight forward - just plug in the headset and turn it on. 2. Comes with a durable adjustable waist or neck band, this teacher voice amplifier does a great job and allows you to keep your hands free to run equipment to demonstrate Amplifies your voice and saves your throat Equipped with a adjustable wired headset microphone, you can adjust the distance between your mouth and the mic. Hi Fi original sound amplification,wearing comfortable, high sensitivity, not easy to have noise. SHIDU S511 15W portable voice amplifier is a good aid to save your throat and make yourself clearly heard across the whole room. Perfect for teachers, tour guides, presenters, salesman, coaches, fitness instructor or people who has a soft voice, vocal cord is paralyzed or whisper. Not only a voice amplifier. This small voice amplifier also can play music from TF card or USB flash drive;The Aux/Line in port allows you to use this teacher speaker to amplify music from cell phones, laptops, MP3 players and more What\'s in the package: 1 * portable voice amplifier 1 * wired microphone headset 1 * USB charging cable 1 * 3.5mm audio cable 1 * waistband 1 * user manual