Marshall's Middleton speaker packs 20 hours of battery life in a fully waterproof body, surrounded by drivers on all sides.
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TREBLAB HD-360 Portable Bluetooth Speaker - Powerful 5-Driver System w/Subwoofer and 8 Bass Radiators, Loud 360° Surround Sound, 90W Stereo, 20H Playtime, IPX4 Waterproof Wireless Speakers : Electronics