Amazon fire tv stick 4K購入。危ない!そのままだと4Kじゃない。ちゃんと4K Ultra HDで見るためにはこうする | しずかなかずし
HDMI SPLITTER 1 in 2 out,4K HDMI SPLITTER for Dual Same Monitors,【Mirror Only,Not Extend】, HDMI SPLITTER for 4K,1080P,3D,【Just Duplicate,Don't Provide 2 Different Outputs】- With 1 Output HDMI CABLE: Amazon.co.uk: Electronics & Photo
Amazon Fire TV Stick 4K review: hold the remote - The Verge
Amazon.com: 4K HDMI Cable 10 ft | High Speed, 4K @ 60Hz, Ultra HD, 2K, 1080P & ARC Compatible | for Laptop, Monitor, PS5, PS4, Xbox One, Fire TV, Apple TV &