Paper-thin and light Portable Solar Charger Super Thin and Light: Solar Paper 5W measures just 3.5” x 7.5” x 0.4” and weighs 5 oz. (0.3 lb.) when folded. Sub panel weighs only 2.2 oz (0.14 lb.) and 0.08” thick.     Fit for both Outdoorsy and Urban adventurers: Those who love mountain climbing would find it convenient, as Solar Paper is super thin and light. Solar Paper’s high portability is also beneficial for urban adventurers since they can carry it around by simply slipping it into a jacket pocket or notebook.   Easily Expandable using Magnets: Embed magnets allow users to easily adjust power amount of Solar Paper by adding or subtracting panels. ​ Plug into the Sun: Solar Paper will give you an opportunity to "plug into the Sun” anywhere, anytime. Enjoy the sunshine! ​ Charge any devices ​ ​ Solar Paper can charge almost any device that can be charged via USB cable, including smartphones, tablets, power banks, GoPro, flashlights, portable game consoles, walkie-talkies, cameras, video cameras, and rechargeable batteries.   LCD Ampere Meter and Auto Reset Feature ​ LCD Ampere Meter: It shows exactly how much current flow from the Solar Paper to your electronic device.    Auto-reset Feature: No need to reconnect the USB cable manually every time solar charger was under the shade. Solar Paper auto resets itself so that your device continues to charge. Hassle-free. How to pick right Solar Paper ​Solar Paper 5 Watt: On a sunny day, it takes 2~2.5 hours to fully charge a smartphone, when exposed to direct sunlight. On a cloudy day, duration will be a bit longer compared to a sunny day.    Solar Paper 7.5 Watt: If you want to charge devices on a cloudy day but want to charge with the speed as that of on a sunny day, then use more panels, 7.5W or 10W. (However, the exact speed may vary depending on the cloudiness.) Solar Paper on a Backpack:Users can easily hang Solar Paper on a backpack using an enclosed string or connectors.  Solar Paper 10 Watt: We recommend 10W Solar Paper for most of Tablets such as iPad, Galaxy tab and Microsoft Surface. Embed magnets allow users to easily adjust power amount of Solar Paper by adding or subtracting panels.