Portable Mini LED Desk Ring Light, 3200-5500K with 1000mAh Battery for Live Streaming, Makeup, YouTube, TikTok, Dimmable LED Ring Light for iPhone and Android Phones

SKU: GW51.0079

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Yes. It’s compatible with iPhone 12 
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Yes, you can turn it off when you dont need it. The phone holder is spring-loaded and extends up to 2-3.2" wide, it is compatible with almost ALL smartphones with or without a case. Including your iPhone 8 Plus, please feel free to purchase it . 
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You just connect it like any other bluetooth device. Hold down the power button until it flashes blue rapidly at the top then connect it in your Bluetooth screen. Worked very easily for me :)