This device is a great idea to save extra cords that get lost. It holds a great charge and charges fast through the attached wall plug. There is no power button. You simply plug your cord into the device and it will charge automatically. The plug on the back is a little unwieldy for a power strip but fits great in a bottom wall outlet. I would recommend this to anyone needing a good, simple power bank option. GET HERE ON AMAZON

*I received this item free or at a discount in exchange for my opinion