The Fire TV Stick 4K also supports high dynamic range (HDR) content, which provides more vivid colors and a wider range of brightness. One of the best features of the Fire TV Stick 4K is the Alexa Voice Remote. Affordability: The Fire TV Stick 4K is a cost-effective solution for those who want to upgrade their TV to 4K Ultra HD and HDR. Limited compatibility: The Fire TV Stick 4K is only compatible with TVs with an HDMI port. Limited customization: The Fire TV Stick 4K has a more limited user interface than other streaming devices.