Please tap the "full screen" icon on the homepage to enter the full screen live > find the "SD/HD" button and adjust the resolution of the live screen.
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SD (Standard Definition): 720P, doesn't offer the same quality as HD but will use fewer network data (bandwidth) and consume less battery than HD. It applies to not-so-good network conditions.
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HD (High Definition): 1080P, offers higher quality video and a better overall viewing experience.