Opteka SP-11W Universal 11-WATT Dual EcoPanel Rapid Solar Charger with 2 USB Ports for Smartphones, Tablets, Battery Packs & Other USB Powered Devices 11-Watt solar charger for all smartphones, tablets, battery pack & most USB devices Rapid charging EcoPanels charge 40% faster then standard solar panels Dual USB charging ports Loops to attach to your backpack or tent for continuous charging while hiking, camping, etc 2 Year Performance Guarantee