About this item COLMO Model 3 accessory smart ring is made of Zirconia ceramics. We extracted the original Tesla Model 3 key card chip and put it into the smart ring accessory. The smart ring accessory can perfectly match your Tesla Model 3 and the smooth surface won’t leave any scratches. COLMO Model 3 key card replacement is easy and convenient to use and fast access to your Tesla Model 3. All needed is just a simple touch. Never to worry about your cellphone is out of grid, out of battery, or don’t have access to your cellphone. COLMO Model 3 smart ring accessory comes with multiple size options: 6-12 US size. You need to stick the ring in the sensing area for 2-3 seconds, otherwise it may not be sensed and cannot be unlocked. Default look of your Model 3 smart key ring accessory is 7 mm width with “T”logo. We accept laser engraving customization service. We can engrave names, logos, and anything you want to your COLMO Model 3 smart ring accessory. If there are any quality and fit problems with this smart ring within half a year after purchase, we 100% accept return and refund services, giving you the most assured guarantee.