The Sharp GX-BT290-BK sits in the middle of Sharp's portable range: 16 W RMS from a stereo pair of 8 W drivers, in a cylinder small enough to travel with and tough enough not to think about. The IP67 rating covers dust and full immersion, and the speaker floats, which makes it a natural fit for pool decks, boats and showers. Its 3.7 V 3000 mAh Li-Ion battery is rated at up to 14.5 hours — the longest running of the three — and recharges over USB Type-C. True Wireless Stereo pairing lets a second GX-BT290 take the other channel, a 3.5 mm aux input handles sources without Bluetooth, and a built-in microphone answers calls hands-free. An RGB light effect runs along with whatever is playing. One pound, in black.

• 16 W RMS total output — 8 W per channel across a stereo pair
• Up to 14.5 hours of play time from a 3.7 V 3000 mAh Li-Ion battery
• IP67 dust and waterproof rating, and it floats
• 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