Three reasons to choose ALLPOWERS solar panels(1)iSolar 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 stabilityALLPOWERS voltage 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.Wide Compatibility18V DC port: charging 18V1A laptops, 12V car battery and other 18V 1A DC-powered devices.5V USB port: smartphones, tablets, external battery packs, or any other 5V USB devices.Warranty18 months product guarantee from ALLPOWERSAttention1. 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%* 2*Output: DC:18V*1A /USB:5V*2A* Compact Size: 300x 160 x 20mm/ 11.8 x 6.2 x 0.7inch* Opened Size: 640 x 300 x 10mm/ 25 x 11.8 x 0.35inch* Weight: 0.48kgPackage including* 1 x Solar Panel Charger* 1 x DC Connect Cable* 5 x Laptop Connectors* 1 x USB Cable* 1 x Alligator Clip(Car Battery Charging Line)* 2 x Metal Hooks* 1 x User Manual* 1 x Retial Package