TeckNet Ultra-Compact 14W Dual-Port Solar Charger with BLUETEK&trade; Smart Charging Technology Cutting edge BLUETEK technology maximizes compatibility with connected devices to enable charge speeds of up to 2 amps under direct sunlight Dual-Port Power: 14 watt monocrystalline solar array provides enough power to charge two devices at a time. Industrial-strength PET panels and polyester canvas ensure weather-resistant durability. No additional battery needed for charging external devices, 100% green energy and built-in dual USB ports for simultaneously charging two devices. Ultra compact size (19.5  15.5cm folded or 54  18.5cm unfolded) and well-placed eyelets allow easy attachment to backpacks while hiking Industrial-strength PET plastic-faced solar panels sewn into high-wear polyester canvas for weather resistant outdoor durability