The Sharp GX-BT390-BK is the largest of Sharp's three portable Bluetooth speakers, pairing 30 W RMS across a stereo pair of 15 W drivers with a build designed for the places music actually gets played. An IP67 rating means it shrugs off dust and full immersion, and the speaker floats — so a knock into the pool is an inconvenience rather than a write-off. A 7.4 V 2000 mAh Li-Ion battery gives up to 11 hours between charges over USB Type-C, and True Wireless Stereo pairing lets two GX-BT390 speakers split left and right for a proper stereo image. A 3.5 mm aux input covers sources without Bluetooth, a built-in microphone takes hands-free calls, and an RGB light effect runs along with the music. The whole thing weighs 1.43 lb.

• 30 W RMS total output — 15 W per channel across a stereo pair
• IP67 dust and waterproof rating, and it floats
• Up to 11 hours of play time from a 7.4 V 2000 mAh Li-Ion battery
• True Wireless Stereo pairing links two speakers as a left/right pair
• Bluetooth V5.0 plus a 3.5 mm aux input
• Built-in microphone for hands-free calls
• RGB light effect and USB Type-C charging