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This rugged indoor/outdoor 5 watt Bluetooth® speaker with solar panel is rechargable via micro USB cable or high efficiency mono crystalline solar panel and has anIPX6 Certified rating - waterproof, dust proof and shock proof. The Green indicator light turns on when solar charging; off when removed from sunlight. Has a built-in mic for hands-free calls and an operating range: 33ft/10m with approximately 20 hours of battery life. It takes approximately 2½ hours USB charging time; 12 hours solar charging time.