Built with 5 foldable high efficiency solar panel, bring more power and stable solar charging experience. Used to charge mobile phones, MP3, PAD or other USB charging devices. Dual USB output ports, convenient to charge the device through the USB charging cable. You can put the battery board in the sun to directly charge your device. It is very suitable for outdoor biking, mountain climbing, hiking, camping, traveling, etc. Specification: Power Max: 12W Output: USB Open circuit voltage (VOC): 5V Short circuit current (): 2A Output voltage: 5V, 2A/18V, 2.21A charging Temperature: -20-70 Celsius Conversion rate: 23-24% Waterproof rating: IP65 Number of USB ports: double Colour: Black Material: Polycrystal + cloth Size: Expanded size: 650x170mm Package Contents: 4 * 12W foldable solar panel Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.