With 10-Watt in this durable and portable panel, you will never have to worry about a dead battery. Perfect for on-the-go activities, this lightweight panel is sure to give you power right when you need it. The RENOGY E.FLEX10 Monocrystalline portable solar panel includes 2 carabineers that can easily attach your panel to a backpack while hiking and 4-suction cups for easy mounting on vehicle windows. The built-in monocrystalline solar cells give maximum efficiency and the new auto-optimization charging feature allows for a continuous charge the moment you’re back in the sun. Add on a RENOGY Drifter (portable battery bank) for back-up power in the shade or at night. Don’t be left without power. This ultra-thin panel is sure to charge any USB device.