DIY Multi-function Power Bank Case 18650 Battery Case Dual USB Interface for Smartphone Tablet EBTPH-508318 FM transmitting or AUX connecting

FM transmitting or AUX connecting

Energy and money saving

Man Type: Backpack Material: 600D-Polyester Capacity: 21L (15

1 × Sound Level Meter

DIY Multi-function Power Bank Case 18650 Battery Case Dual USB Interface for Smartphone Tablet EBTPH-508318 FM transmitting or AUX connectingProduct Features: This is a DIY 18650 power bank case. You can put 1 to 4 18650 batteries into the slot. Simply install 1 4 batteries to make your own power bank (batteries not included) Dual USB charging ports that can allow you to charge two devices at the same time LCD display, it can show the remaining electric energy and working state Two independent circuit board inside. Support different brand batteries, different capacity batteries, different