Chromecast Ultra 4K HDR plugs into your TV's HDMI port, enabling 4K Ultra HD, HDR, and Dolby Vision streaming from apps like Netflix, YouTube, and Disney+ via Wi-Fi or Ethernet, controlled by your phone, tablet, or voice assistant. It offers faster performance, an Ethernet port for stable connections, and supports Google Assistant voice commands, making it ideal for high-quality content on 4K TVs