Opteka SP-14W Universal 14-WATT Quad Panel Rapid Solar Charger with USB Port for Smartphones, Tablets, Battery Packs & Other USB Powered Devices 14-Watt solar charger for all smartphones, tablets, battery pack & most USB devices 4 Rapid charging Panels Dual USB charging ports with built-in stop / start technology Loops to attach to your backpack or tent for continuous charging while hiking, camping, etc 2 Year Performance Guarantee