Features: Elevates your outdoor activty with our multifunction 21700 Waterproof Battery Pack Case, designs to power your bicycles lights and charge mobile devices on the go, ensuring you're never leave or disconnected. Produced from plastic, this battery pack case features a double interfaces with USB outputs, a waterproof build, and intelligent power display, making it a stable company for any cycling enthusiasts. Suiatble for cyclists, outdoor enthusiasts, and individuals who require a portable power solution for their bicycles lighting systems and electronic gadgets while exploring the great outdoor. Whether navigating through nighttimes trails or embarking on long distances ride, this battery pack case provides the necessary power to keep your bike lights bright and your devices fully charges. Experience uninterrupted connection and illuminates during your cycling trip; our battery pack case is a must get accessory that combines functionality with convenience, enhancing your overall ridings experience. Specifications: Material: plastic Size: about 50.5x64.3x95mm Package Includes: 1x21700 Battery Holder Case note: Please allow 1 to 3cm error due to manual measurement, please make sure you not mind before you bid, Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.