Fuhjythy 21700 DIY Power Bank Case Supports 4x21700 Batteries PD20W Powerbank Case LED Screen Transparent Battery Storage Shell A

High Capacity & Fast Charging: power bank with this DIY kit compatible with 4x21700 batteries. Features a powerful PD20W output to charge your devices . Universal Compatibility: Designed to ensuring a wide range of use. Intelligent LED Display: Comes equipped with a clear LED screen that displays charging status and battery levels at a glance. The transparent case also allows you to see the inner workings, adding a stylish touch to functionality. and Portable: The robust and design makes it easy to carry. Ideal for travel, business trips, or daily use to keep your devices powered throughout the day.