1. THE USB PORT PROVIDES 5V Regulated Output, and the DC Port Provides 12V Charging for Energy Storage Devices 2. Connect DC5521 Ports in Parallel Between Multiple Solar Panels to Increase Output Power 3.PRODUCT Use: Charge Mobile Phones, Action Cameras, Power Banks, GPS, and Other Electronic Devices 4. [High conversion efficiency] The high conversion efficiency of the 15W single -crystal solar panel is 22 %. It can generate electricity in the case of insufficient light and charge the equipment in a short period of time. 5. [Folding and kick design] This 15W solar panel weighs only 465 grams, and the folding size is 215*205*23mm, which is suitable for camping or outdoor work. Solar panels are waterproof, and you don't need to worry about bad weather conditions.