When the power bank arrived, please run out of the power. and then full charge the powerbank, it needs 24 hours. after 24 hours the power is normal, generally speaking, you can use the goods 4 times. Features: Equipped with single crystal silicon solar panel, where there is light, there is power. Dual USB outports, charge two devices at the same time. Portable light weight durable reliable high quality Lithium-ion battery. Hold 300000mAh of reserved power. Water resistant dust proof and shock proof, ideal for outside use. Dual super bright LED light with 3 mode for emergency. Compass and hook as gift, get your way on the moving. 100% customer service satisfaction Specification Battery type:Li-polymer battery Solar panel:Single crystal 1.5W Material:ABS+PC+Silicone Input: DC 5V/1.0A Output 1:DC 5V/1A Output 2:DC 5V/2.1A Battery capacity: 300000mAh Packaging Content: 1*Solar power bank 1*Gift Note: 1.The solar feature is designed for emergency, please DO NOT take it as primary power resource. We highly recommend charge the power bank by wall outlet. It takes around 12 hours to fully charged and will last much longer. 2.If any problems please do not hesitate to contact us. We'll do our best for you.