ION Audio Solar Stone | Wireless Solar-Rechargeable Outdoor Speakers (Pair) 6.5-inch full-range speaker and powerful onboard amplifier really pump up the volume 48-hour rechargeable battery provides long-lasting, uninterrupted musicRecharge by embedded solar panel or with AC power adapter**Speaker charges in 6 hours by AC, and 55 hours by Solar Panel IPX4 waterproof so you can leave it out in the rain Wirelessly streams music from any Bluetooth device**** Bluetooth Range - up to 100 between Solar Stone and Bluetooth source Speakers link together wirelessly for genuine stereo sound ***Completely wireless operation: no power cord, no audio cables***Wireless Stereo Range - up to 30 between two Solar Stones