Specifications:It is a high-tech smart ring, built-in NFC chip, you can set the smart door lock, the important file lock of the mobile phone, etc. Suitable for any device as if support NFC .Type: Smart RingQuantity: 1 PcTheme: JewelryGender: MenStyle: SmartMaterial: Stainless SteelOccasions: Daily Life, Gift, Party, Pub, Prom, Business, etcFeatures: Jewelry Decor, Gift, Men Ring BandRing Size:US Size 6(Dia.): 16.4mm/0.65" (Approx.)US Size 7(Dia.): 17.3mm/0.68" (Approx.)US Size 8(Dia.): 18.1mm/0.71" (Approx.)US Size 9(Dia.): 18.9mm/0.74" (Approx.)US Size 10(Dia.): 19.7mm/0.78" (Approx.)US Size 11(Dia): 20.6mm/0.81" (Approx.)US Size 12(Dia): 21.4mm/0.84" (Approx.)US Size 13(Dia): 22.2mm/0.87" (Approx.)US Size 14(Dia.): 23.1mm/0.91" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. Package Includes:1 x Smart Ring