Wynnsoft Dual USB Waterproof Solar Battery Charger - Green HIGH EFFICIENCY SOLAR PANEL - 1.2W monocrystalline solar panel, it can be charged automatically when put under the sun LI POLYMER BATTERY - Build-in 5000mAh lithium polymer battery DOUBLE USB INTERFACE DESIGN - well compatible with mobile phones, table, pc WARRANTY - 100% Money-Back Guarantee policy COMPATIBLE WITH 99% DIGITAL DEVICES - Bluetooth, Earphones, GPS, PADs, Camera, Mobile PSP, MP3/MP4 Etc.