HD High Definition refers to a high degree of detail in an image or screen; it provides resolution and quality higher than the standard-definition. HDMI With the High-Definition Multimedia Interface (HDMI) inputs in the Sansui LEDs, you can stream high definition content from Blu-Ray players, laptops and other devices. Besides, the Sansui LEDs are optimized to process high definition content and deliver jaw-dropping picture and sound quality. Happy viewing! Atom Sound If you like your entertainment loud and clear, then the ATOM Series is made for you. Designed with superior audio technology, now you won’t need additional speakers to amplify the sound.Its hi-fidelity equipment reduces distortion and increases sound sensitivity. With such exciting features, it’s time you move up your TV viewing experience.