USB 4K Video: Yes. Smart Ultra HD 43EH2K provides a wide range of connection possibilities. HDMI 4K @ 60 Hz (2.1): x4. USB Software Update: Yes. Backlight: LED. Sound Settings: Sound Equalize. USB Music: MP3, M4A, AAC, AC3, EAC3, DTS, WAV, FLAC, LPCM.