Check the listing for details. Edinruis RFID Rewritable Ring Black US#10 Dual Frequency Smart Ring. Condition: New. Listed at 44.99 USD. Allowing you have more choices to fits your fingers. It is waterproof and fashion. You can wear it for outdoor activities such as running, swimming, etc Widely Used: The smart rings are easy to use, simply touch the ring to the reader for instant access.
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