made for amazon, usb power cable (eliminates the need for ac adapter) mission cables unlike simple usb cables, mission usb power cable for amazon fire tv 4k includes special power booster technology that increases the peak power output of your usb port. by storing excess power in the embedded battery and then releasing it when your amazon fire tv 4k demands more power than your usb port can handle, you can be sure to avoid brownouts and resets, even during the most demanding 4k streaming and gaming.