Product Descriptionthe YJOOEquipped with a compact solar panel， which could recharge itself under sunshine for emergency purpose while outdoor (kindly note that the solar panel is only design for emergency， not a primary source of charging).Superior portability design (130 x 80 x 13MM)， easily hang it on your bagpack with the inluded hook， hands-free on the goBuild-in Lithium Polymer battery cells: anti-explosion， lightweight， compact and reliable. Long lifespan with more than 500 recharging times.Compatible with most 5V Dual USB-charged devices， 30000mAh could charge an iPhone thrice， or a large capacity smartphone 3-4 times， or an iPad mini 2-3times.Color:black