ACTIVATION&USE: Find the right sensor spot on the B pillar under the driver side camera and touch your knuckle onto the B pillar (knocking position) and do not touch the ring directly to the car. TECH: One ring works with multiple cars. The ring is compatible with Model S and Model X vehicles produced in 2021+ and all Model 3 and Model Y vehicles. The ring has the same security level as Tesla key card. WATERPROOF&NO CHARGING REQUIRED: No longer have to worry about staying without a key when the phone battery is dying. CNICK Rings are waterproof. No need to remove your ring while washing hands, taking shower, or swimming. HANDMADE: Made of Zirconia ceramic and gemstone materials. We managed to make the ring thinnest and the lightest which makes it the most comfortable to wear. Ring dimensions: Width: 8mm (0.31"), Thickness: 1.8mm (0.07".) Learn more: TESLARING COM. World's First Tesla Key Ring | Generation 2 | The Most Convenient and Reliable Backup Key.