Auto-Restart Usb OutputUSB circuit board Built-in Smart IC frequency technology automatically adjusts to connected devices and provides the optimal charging current to minimize charging time. It can be used to charge 5V/2A mobile phones, Bluetooth speakers, smartwatches, earphones, etc. Higher Efficiency ETFEHighly efficient Monocrystal solar cells convert up to 22.20% of solar power into free energy in enough sunlight, and ETFE solar panels are the most durable panels currently, standing up to elements and wear and tear better than conventional PET solar panels. Portable CarryThe Portable solar panel charger is a great option if youre taking an extended camping trip or if youre traveling somewhere with an unreliable power grid. With compact Fold size(8.4 x 7.9 x 0.8inches) and lightweight design(0.69 lbs - only panel), it's portable and light enough to fit into any camping backpack or hiking daypack. it is a great choice for outdoor activities, travel, and emergencie