90W Max Bluetooth Speaker, IPX6 Waterproof Portable Speakers Wireless Bluetooth,

This waterproof speaker doubles as a power bank for other devices. 90W Peak Super Enhanced Bass and Hi-Fi Stereo – The 90W PEAK high powerful Bluetooth speaker has the latest state-of-the-art FOUR DRIVERS and TWO PASSIVE BASS RADIATORS to enhance deep bass and super high Hi-Fi sound.

eBay