Advanced DIY Power Bank: This kit includes an aluminum case designed for assembling a custom power bank, supporting both 21700 and 18650 batteries. Create your own high-capacity power bank without any need for soldering! High-Speed Charging: Features dual USB-C ports for two-way fast charging. Power up your smartphone and laptop quickly and efficiently, anywhere and anytime. Versatile & Portable: Ideal for travelers and tech enthusiasts, this easy-to-assemble kit is and compact, making it easy to carry in backpacks or bags. Enhanced Safety: Constructed with premium materials, ensuring a build that protects against overcharging, overheating, and short circuits, ensuring your devices are safe while charging. Note: The case comes without batteries. Please you purchase the appropriate 18650 batteries separately. Due to different batches, there may be differences in product appearance and printed text, which not affect use Use For 18650 batteries Colour:Black Material:Aluminum Alloy Package Contents: 1x Power Bank Case(bulk parts) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.