We test all the things from tiny travel models to forty-pound yard blasters. All of them incorporate rechargeable batteries for portability. Anyone who owns a smartphone or tablet is likely to love owning a portable Bluetooth speaker, which usually incorporates a rechargeable battery and is usually waterproof and/or dustproof. https://www.bluetoothspeaker.top/bluetooth-speaker-wireless-portable-sound-equipment-karaoke-audio-stereo-speakers/