Features: Experience the convenience of on the go charging with our Super Fast Charging 18650 Battery Box Case, a must for keep your electronics power. Crafted from aluminum alloy, this battery case features a technology ensuring compatibility with a wide devices and a stable current for energy use. For enthusiasts, frequent traveler, and outdoor adventurers who rely on their gadgets and require a reliable power wherever they go. Whether you're embarking on a hiking trip, attending business meetings, or simply navigating jungle. Customize your charging experience with our colorful selection of battery case, and never worry about running out of power again; just insert your own 18650 or 21700 batteries and keep your devices charging at all times. Specifications: Material: Aluminum Alloy Charging Power: 10W Battery: 1pc 18650(2600mah) or 1pc 21700(5000mah) Battery Requires(NOT Include) Size: About. 102x25mm/4.02x0.98in Color: 4 color optional Package Includes: 1pc Charging Case(Battery NOT Include) note: Battery NOT include. Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.