BRAVEN 855s Portable Wireless Bluetooth Speaker [20 Hours Playtime][Rugged] Built-In 8800 mAh Power Bank Charger - Black/Gray The 8800mAh battery will play for up to 20 hours 20W of stereo output IPX3 Water Resistant Stream your music over Bluetooth by syncing with a compatible device Use the built-in noise cancelling mic to make and take calls wirelessly on your own, or in a group