The rear camera module on your Xiaomi Redmi 9C is perfectly safe with this tempered glass protective lens.
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Anbzsign [2 Pack] Xiaomi Redmi 9 / Redmi 9A / Redmi 9C (2020) Privacy Screen Protector, [Full Coverage] [Case Friendly] Anti-Spy 9H Hardness Tempered Glass : Cell Phones & Accessories
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Xiaomi Redmi 9C Double Card Case KSQ - Dealy