It’s easy to find an Ultra HD 4K TV. It’s not easy to find 4K content to watch on it. The Roku Ultra aims to make it easier. The venerable streaming box’s latest flagship supports 60fps 4K content in HDR and upscales lower-res content with a quad-core processor that also helps the interface speed along. There’s fast Wi-Fi for clear streams, Ethernet for those who want a wired connection, a microSD slot for added storage, and Dolby Digital decoding for better surround sound. The remote has voice search, a headphone jack for private watching, and gaming buttons, plus the always handy feature that lets you easily find it when it’s been eaten by your couch.