Key benefits Expands capacity with up to 12 18650 cells, increasing overall power and runtime for your devices. Compatible with flat 18650 batteries; insert with correct polarity to ensure safe operation. Digital display shows power status and remaining capacity at a glance. Builtin camping light provides practical illumination for outdoor use or lowlight situations. Compact and portable, designed for mobile use and easy transport. What you need to know 18650 batteries are not included and must be purchased separately. Only use 18650 cells whose positive terminal is flat; pay attention to the orientation of positive and negative terminals. Material and exact dimensions are not specified in the product listing. Use scenarios Outdoor camping or emergency backup: charge phones, GPS devices, cameras, and other USBpowered gear while using the builtin camping light to illuminate your campsite. Remote work, travel, or fieldwork: a portable charging solution that keeps essential devices powered, with a digital display to help manage power usage. Notes This description preserves the product's original function, compatibility, and features: a mobile powerbank case that supports multiple 18650 cells, includes a power status display and a camping light, and requires separate of cells.