Features: 1. This voice amplifier can provide 5w clear and soft sound to cover about 1000 square meters, let everyone hear what you say. 2. Compact size and lightweight, comes with an adjustable strap, allows you to wear it on the waist or hang around the neck, easy to carry around. 3. It supports USB flash drive, TF card, phone and computer playback, you can repeat a single tune, loop all music, and switch songs/recording content. 4. 2200mAh Large capacity rechargeable battery, only need to charge for 4 hours, can last for 4-6 hours. 5. Surround 3D sound field, provides high sound reproduction and clearer sound quality, make your voice clear and soft, and will not produce harsh noises. 6. With display screen, easy to read. 7. With a headset microphone, release your hands so you can talk while doing other things.