What‘s the meaning of 4K Output ?

HDMI 1.4:
  1. 4,096x2,160-pixel 24fps 3,820x2,160 up to 30fps,3840x2160 pixels high @ 24Hz  25Hz | 30Hz
  2. 4096x2160 pixels high @ 24Hz  H.264 only,   
 
HDMI 2.0:
  1. 4,096x2,160-pixel 60fps 3,820x2,160 up to 60fps,                                                           
  2. 3840x2160 pixels high @24 Hz 30 Hz 50 Hz 60 Hz                                                  
  3. 4096x2160 pixels high @ @24 Hz 30 Hz 50 Hz 60 Hz       
HEVC H.265 supported
Amlogic M802 cpu need debugging to be compatiable.
Available in the end of May . No need change HDMI cable, backwards-compatiable with HDMI 1.3 /1.4 cable