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This waterproof wireless speaker plays for 15 hours and costs $13 - CNET
Vtin SoundHot Portable Bluetooth Speaker | These Outdoor Speakers Are Ready For Whatever You Throw at Them — So Bring On the Summer Adventures! | POPSUGAR Technology UK Photo 31
VTIN's Bluetooth Speaker Lineup | Unboxing, Review, and Sound Test! - YouTube
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VTIN R4 Portable Bluetooth Speaker with IPX5 Waterproof & Built-in Mic | eBay
Vtin 20W Portable Bluetooth TWS Speaker Wireless Dual Drivers Stereo Bass Subwoofer USB TF FM TWS