Levin 12000mAh Rain-resistant Solar Panel Dual USB Port Charger Power Bank for Smartphones & Tablets - Black Solar energy technology, environmental friendly and could recharge itself under sunshine for emergency purpose when outside; Levin solar charger+ can fully charge your phone for emergency after being solar charged for 2 to 3 days under normal sunlight;Water resistant design ensures the device functions smoothly when it's raining; Shock-proof feature ensures the device working properly even it crashes or drops.perfect for hiking,camping and other outdoor activities Grade A cell, Build-in 12000Ah Lithium Polymer battery which chareges via a powerful 1.7W monocrystalline solar panel ; two output allows for simultaneous charging of your devices at same time ;Anti-explosion, lightweight, compact and reliable, 1000+ recharge cycles over the life of the battery. Please do not place Levin solar charger Giant+ on over-heated place for continuous charging. Levin solar charger Pro is with built-in Polymer battery, one of the safest battery in the world, wCompatible with hich are not possible to explode even over-heated, but it might swell up Compatible with most kinds of 5V USB-charged devices. Stylish, compact and lightweight design fits perfectly into any bag, easy to carry on the go Package includes: Levin&Trade; Levin solar charger Giant+ External Battery, hook, micro USB cable, instruction manual Hook up your tablet and smartphone together to the Levin solar charger Giant+ or help charge up a friends's smartphone alongside yours- there's more than enough power to go around