Features: Adjustable DC5V-12V 18650 battery case delivers versatile power output for smartphones, LED lights, and portable electronics, featuring built in overcurrent/overvoltage protections for secure charging. Easy assembly design enables quick setup with 18650 batteries, crafted from lightweight yet durability plastic for extended use. Ideal for enthusiasts, campers, and emergencies preparedness users seeking customizable portability power solution for gadgets small devices. Effortlessly power camping gear during wilderness trip, serves as backup energy for home routers, or charges USB devices during extended travel. 18650 battery case compatibility for digital cameras, and mobile workstations. Specifications: Component: Plastic, Size:Approx.19x8x2.5cm/7.48x3.15x0.98inch,15x8x2.5cm/5.91x3.15x0.98inch, 22.2x8x2.5cm/8.74x3.15x0.98inch; Interfaces:6Slot,8Slot,10Slot, 6Option Type; Support DC5V-12V voltages adjustable function, suitable for power supply needs Suitable for use in a variety of scenario, emergencies backup power supply, to meet consumers' diverse needs for mobile power supply. PowerBank Case only, other accessories in the picture is not included! Tips: 18650 batteries are not included in the package, you need to purchase separately. Can only use the 18650 battery of which positive electron is flat top. Please pay attention to the direction of the positive and negatives poles. Package Includes: 1pc Battery Case note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.