... . 3.Low self-discharge 4.Light and small. Solar Foldable BagParameter of Solar Bag:Solar Power: PET, 5W*4 (STC: 100mW/cm2)Weight: 950gSize ... .4V, 12V, 16V, 19V/3.5-4.0A FeaturesHigh-capacity solar panel can be folded twice to save the occupation space ... . Low self-discharge, can be store 1 year without using. Solar Outdoor Power Solar Foldable Bag