Yes, you need to use the power supply that comes with Chromecast Ultra | What to Watch
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Amazon.com: Wall Charger Adapter Power Cord Cable for Google TV CHROMECAST Ultra NC2-6A5-D : Electronics
Chromelock secure enclosure for "Chromecast with Google TV" | Solvacom
PK Power Wall Charger Adapter Power Cord Cable for Google TV Chromecast Ultra NC2-6A5-D - Walmart.com
USB-C Gigabit RJ45 Adapter With PD100W Passthrough Power 1000Mbps Ethernet Speeds for ChromeCast With Google TV Wired Ethernet
TV xStream Ethernet Adapter (Black) for Chromecast Ultra/2/1/Audio, Amazon Firesticks 4K Sticks, Micro USB to RJ45 Ethernet Adapter with USB Power Supply Cable (3.3ft) - Walmart.com
Google Chromecast 4K - TV & Projector Lobby - AV Discourse Community Forum (SG)
Google Chromecast 4K Google TV - AT&T
Google Chromecast quick review
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I can't reset it.... So now what? See comment for details about what is happening : r/Chromecast
How to install Chromecast on a Samsung TV - YouTube
Wall Charger AC Adapter Cable for GOOGLE CHROMECAST TV 1ST GEN H2G2-42 Power PSU | eBay
Best Buy: Google Chromecast Ultra 4K Streaming Media Player Black NC2-6A5-D
Google Chromecast with Google TV 4K HDR Streaming Media Player (Choose Color) - Sam's Club
Ethernet Adapter for Fire TV Stick,Fire Stick 4K Ethernet Adapter,for Chromecast Ultra/Google Home Mini and Other Streaming TV Sticks.Micro USB to RJ45 Ethernet Adapter with USB Powered Supply-3.3ft - Newegg.com
Genuine Google Chromecast Ultra Ethernet AC Adapter 5V/1A Power Supply Charger | eBay
Ethernet Adapter For Fire Tv Stick Google Home Mini Chromecast Ultra 2 1 Audio Micro Usb To Rj45 With Usb Power Supply | Fruugo NO
Genuine Google Chromecast Ultra Ethernet AC Adapter 5V/1A Power Supply Charger | eBay
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Smart TV Stick G2 Chromecast 4K UHD με Wi-Fi / HDMI | G for Gadget