Clear and Loud Sound: Built-in latest Bluetooth 5.0 chip, adopting UHF transmission, providing clear, crisp and loud sound to cover about 10000 sq.ft (1000 ). The stable performance,no nosie ,no distortion and no sound delay.Amplifys your voice and saves your throat pefectly. Multifunctional Voice Amplifier: Support Bluetooth,TF card, USB. FM radio, Recording, AUX-IN and Echo adjusting. Connect to your phone via Bluetooth, play music. Listening to the radio. It can repeat single tune, loop all music and switch songs. Adjustable Microphone Headset: The wired headset microphone is adjustable. You can adjust the distance between your mouth and the mic. It can be positioned near your mouth with its flexible gooseneck design. The headset sits on top of the head so it is stable and won' t fall off. Portable and LightweightThe voice amplifier in Compact size (4.1 x 1.4 x 3.4 inches) and super lightweight (0.8 lb.), you can use the back detachable clip to fix it on your belt or pocket, or you can also tie it around your waist or hang it on your neck with the help of the waistband. Long Battery Life: With built-in a 2200mAh rechargeble lithium battery, you can use it for up to 12 hours with a fully charged battery. So you can enjoy the functionality of our multipurpose voice amplifier for full day as it is equipped with a powerful battery.