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The clock runs on battery with the supplied USB cord and adapter powering the device. When running, it uses more power than the charger can supply. So after fully charging the device then leaving it plugged in and on it will eventually go flat and turn itself off. It won't last 12 hours even when plugged in. Which is not good if you plan to use it when going away. Set up is easy but the included instructions are useless. Once it's set up you need to follow your nose in the app settings to figure things out. Picture quality is decent but definitely NOT 4k. I would say not even 1080p.