According to the official Apple support page, Low Power Mode makes these changes to conserve your battery's charge:

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- Amyapwr

image source - Google 

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Turns off 5G (except for video streaming)

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Sets your iPhone screen to turn off after 30 seconds of inactivity

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Reduces display brightness

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Lowers display refresh rate for iPhones with ProMotion

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Eliminates some visual effects

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Pauses iCloud Photos sync

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Suspends automatic downloads

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Pauses email fetch

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Stops background apps from refreshing

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