The 1080p HD streaming on YouTube or NETLIFX requires 5.0 Mbps (Megabits per second) stable connection while the 4K UHD streaming needs AT LEAST minimum a 25.0 Mbps (Megabits per second) stable connection. If you have a 25M internet plan with us, you may not be able to watch 4K UHD video smoothly because any fluctuation of your downloading speed will cause buffering for 4K video streaming. We recommend to have at least 50 Mbps downloading speed to watch the 4K video.