
It was capable of 10 bit 4:4:4 on the HD model in 1080p.

My new TV is a 4k TV and the Chromecast 4k runs at 10 bit 4:2:0. But there was a big difference when HDR formats were part of the image (HD model didn't have as many pixels to work with and the image was then darker). You need larger than a 50" TV to notice, at 7 feet or further away. Honestly not a huge difference between resolution of the HD and 4k devices, because most content we still watch is HD. I tried the HD model on my new 4k TV for a while, and it still looked excellent on everything that wasn't in HDR10 or other newer black level format. I upgraded from the HD model (used on an older TV) after buying a new LG TV that has really poor smart features implementation. Most phone chargers these days have more than enough amperage. I've also found that you can run this off of a 5 volt phone charger, so long is the amperage is enough. I can verify that the plug for this is a USA style plug but you can put an adapter on it because it is 100 volt to 240 volt capable.

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