Car Smart Finger Key Ring with Box Fit for Tesla Model 3 / Y All Year Smart Ring Acceory for Tesla Model 3 /Y RFID Technology Key Card Key Fob Replacement your Tesla Comes with an RFID reader implanted into the center of driver-side B-beam. The term RFID refers to radio-frequency identification. The implanted RFID reader uses electromagnetic fields to automatically identify the electronically stored information in your smart ring. And meanwhile, the smart ring acceory collects energy from the RFID reader&x27;s interrogating radio waves. Comparing to Tesla key fob and any other key fobs, there is no charge and battery needed for your smart ring. Your smart key ring is the perfect replacement for your original Tesla Model key cards. So you wont need to buy additional key cards, key card covers, and key fobs. Its also a great way to save some space in your pocket, your handbag, or your purse. Specification: Item Type: Smart Key Ring Material: ceramics Color: Black or white Fitment: Fit for Tesla model 3 All years Fit for Tesla model Y All year Note:Do not fit for Tesla Model X/S How to Use: 1. Organize and clear the central control sensing area 2. Click the car shape button in the lower left corner of the central control screen 3. Click the middle lock button 4. Click the "+" to the right side of the key 5. Put our smart ring on the central control induction area 6. When the screen pops up "Induction of existing key card to approve pairing", place the original car key/card in the central control induction area for authorization and wait for completion. Package List: 1 x Smart King 1 x Packing Box