Long-life rechargeable battery with around fifty hrs of cordless sound and USB port for charging devices Still, It is good for listening at medium volumes, And it will give your ears a split from headphones and allow you to be additional mindful of what else is around you. With https://www.bluetoothspeaker.top/factory-price-wireless-bluetooth-speaker-waterproof-with-usb-tf-tws-function-copy/