Amazon fire stick comes with two separate units one is fire stick & the second one is its Alexa remote. Fire stick works on direct home supply but remote works on batteries so you need to change batteries after draining. Amazon Fire stick enhances the level of your entertainment from mobile screen to TV screen. Picture quality depends on your TV. In case you encounter Fire TV Stick 4K Problems with device then contact Fire Stick team by dialing this toll free number which is 1866-947-8499 to get the best solution of your issue easily.