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Ceramic Material: The R4 ring is made of microcrystalline ceramics, with excellent refractive index and dispersion performance, giving off a unique

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Features: Water Resistant and no charging required. Lock and unlock your smart phone or tablet quickly, hide the app when you leave your smart phone alone. Control applications, you can write a fixed process list ahead of the time, and the ring will start the applications each time by simply touch. Share and transfer information, support all Android and Windows NFC mobiles.

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