This high-capacity 30000mAh portable battery bank is the perfect companion for outdoor activities, camping, and travel. Say goodbye to low battery anxiety, as this powerful gadget can quickly charge your mobile phone and tablet. With its built-in high-quality, environmentally friendly Li-ion rechargeable batteries, you can expect an average conversion rate of 88% and a long lifespan of about 300 charging and discharging cycles. Featuring solar panels on the top side, it can absorb solar power into electricity and has an emergency LED light, activated by gently double-clicking the power button. The dual USB output interface allows for charging of two mobile phones simultaneously, and the charging port is water and dust-proof. With a carabiner for portability, it can be charged anytime, anywhere there is sunlight. Compatible with most electronic devices, use it as a power source while on long-distance trips. To charge, use solar or connect it to a USB port. The package includes a carabiner, USB cable, user manual, and box.