Don’t risk getting stranded off the grid with a dead battery and no outlet in sight! Charge directly from the sun! Engineered with an industry-leading 21 to 25% solar energy conversion rate, this power bank's high-efficiency solar cells provide enough power to rapidly charge two devices simultaneously. This portable solar panel is a must-have addition to your outdoor gear. Whether you’re heading to the park, campground, or beach, going on a hike or backpacking through town, you can enjoy the outdoors with confidence that your mobile devices will stay charged!