Features: Thissmart ring key card key fob nfcreplacement is theultimate solution for model 3/Y owners who want a comfortable and convenient way to access their car without worrying about losing their key. Made of high-quality zirconia materials, this handmade ring is incredibly thin and lightweight, making it a breezeto wear all day long. Perfect for techsavvy owners who want to streamlines their dailyroutines and enjoy the latest in smarttechnology. Whether you're running errands or going on a road trip, this waterproof ring is the perfect companion for any adventure. No need to worry about taking it off while washing your hands or swimming! With its easy activation and use, thissmart ring key card key fob nfcreplacement is the perfect way to upgrade your experience and stays ahead of thecurve. Specifications: Material:ZirconiumOxide 6# Size: Approx.16.5x53mm/0.64x2.08inch 7# Size: Approx.17.3x56mm/0.68x2.2inch 8# Size: Approx.18.2x59mm/0.71x2.32inch 9# Size: Approx.18.9x62mm/0.74x2.44inch 10# Size: Approx.19.8x65mm/0.77x2.55inch 11# Size: Approx.20.7x68mm/0.81x2.67inch 12# Size: Approx.21.3x71mm/0.83x2.79inch Color:Black For TeslaModel 3/Y Unlocking mode: inductive identification Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x SmartRings