The Apple HDMI 2.0 cable supports 18 Gbps. The Belkin 8K (HDMI 2.1) cable supports up to 48 Gbps, which is required for high-frame-rate gaming and the most advanced 12-bit color profiles.

Yes. The 3rd Gen remote is backwards compatible with the Apple TV 4K (1st and 2nd Gen) and the Apple TV HD. Your device must be running tvOS 15.4 or later to support all features of the 3rd Gen remote.

The official Apple-branded cable is 1.8 meters (approx. 5.9 feet). The Belkin version sold by Apple is slightly longer at 2 meters (6.6 feet).