Note: because the iphone mobile phone has a charging protection design, it needs to reach a certain light to charge it, and the iphone mobile phone cannot be charged under low light. It needs to be used with a mobile power supply.Enjoy High Tech ChargingYour Satisfaction is our Highest Priority, contact us firstly if you have any question.(1)Solar Technology, deliver the fastest chargeIt can automatically adjust the current and voltage to achieve maximum power, delivering its fastest possible juice.(2) Equipped with Voltage Regulator to ensure stabilityvoltage regulator can keep your device getting stable current and prolong its life.(3) Best designCompact size design for portability, with the free hook, you may just hang it on your bagpack when outdoors.Attention1. please check the model, size, voltage and power of your original adapter to ensure compatibility before using. Please close the laptop firstly before charging, solar panel is only design for emergency, not a primary source of charging for laptop2. Apple as security system, please unplug the USB cable and put the charger in direct sun if your iphone show "this item is not support"Specification* Solar Panel Peak Power: 21W* Transformation efficiency : >22%-25%* Output: Dual USB:5V*2A* fold Size: 290x 170 x 30mm* Opened Size: 700 x 290 x 16mm* Solar Panel Peak Power: 15W* Transformation efficiency : >22%-25%* Output: Dual USB:5V*2A* fold Size: 290x 165 x 15mm* Opened Size: 520 x 290 x 16mm