The Roku Express 4K is a streaming media player that supports 4K HDR content with a maximum resolution of 3840 x 2160p at 60 frames per second. It also features a dual-band Wi-Fi connection and supports HDR10 and Dolby Atmos. Here's a more detailed breakdown of the Roku Express 4K's specifications: Video: Maximum Resolution: 2160p (4K). HDR Support: Yes, supports HDR10 and HLG. Video Codec: H.264. Output: 1x HDMI 2.0 Female. Audio: Dolby/DTS Support: Dolby Atmos. Connectivity: Wireless: Wi-Fi 5 (802.11ac). Other Features: Remote Control: Included, often a voice remote with TV controls. Power Source: AC adapter. Streaming Services: Access to popular services like Netflix, Apple TV+, Disney+, Hulu, Prime Video, and more. Operating System: Roku OS. RAM: The Roku Express 4K and other Roku devices like the Streaming Stick and Express+ have 512 MB of RAM. Physical Dimensions: Size: 3.7 x 0.80 x .45 inches. Weight: 0.90 ounces (26.0 g).