Features: Mecha styled design, the 21700 replaceable battery designing allows users to go out without worrying about low battery levels. Can accommodate 1 3.7V 21700 battery (flat end head), battery not included, easy to use. Adopting high-strength ABS, providing excellent wear resistance and shock resistance. Suitable for various usage scenarios, capable of handling everything from daily commuting to outdoor adventures. Its flexibility meets the diverse needs of different users and is an indispensable mobile power solution in life. Compact battery storage box empty housing case design, saves space and is easy to carry. Specifications: Component: ABS Dimensions: 85x50x25mm Color: black, silver (optional) Parameters: Suitable for 21700 model replaceable battery, built-in ejection plug accent design for quick battery replacement Package Includes: 1Pc 21700 Replaceable Battery Mobile Power Supply Housing Case note: Includes casing, motherboard, and battery box components, 21700 batteries and other accessories demoed in the pictures is not included.. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.