ALLPOWERS 20W 5V Solar Phone Charger Dual USB Output Portable Solar Panel1. It can automatically adjust the current and voltage to achieve maximum power, delivering its fastest possible current up to 2. 4A under direct sunlight 2. Portable and frame design fits for outdoor and indoor use 3. Transformation efficiency: 22% 25% 4. Solar Power: 20W 5. Output: 5V 2. 1A(Max) 6. Compact Size: 306x 182 x 13mm 7. Opened Size: 592 x 306 x 3mm Specification: Package Weight One Package Weight 0. 82kgs 1. 81lb One Package Size 33cm *