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Amazon.com: Mission USB Power Cable for Chromecast with Google TV (Power Chromecast Directly from Your TV) : Electronics
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Amazon.com: Mission USB Power Cable for Chromecast and Chromecast Ultra ( CHROMECAST NOT Included) : Electronics
Why does the Google Chromecast need external (USB) power? Can't it draw power from the HDMI port like any plug and play USB device? - Quora
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