Long-life rechargeable battery with up to 50 several hours of cordless sound and USB port for charging devices A person draw back is that the volume can't be adjusted with the remote control, which could possibly be inconvenient for a few users. For us, the speakers that amazed us https://www.bluetoothspeaker.top/subwoof-large-volume-wireless-stereo-music-player-bluetooth-speaker-wireless-bluetooth-speaker/