Tesla’s Model 3 doesn’t come with a physical key. Instead, it can be unlocked and turned on with a smartphone, a car-shaped key fob, or a keycard that comes in handy if you don’t have a fob or your phone dies. One creative driver figured out a way to make sure that she can always unlock and start her Model 3: she implanted the RFID tag from the keycard into her forearm.

Read more - https://www.theverge.com/2019/8/12/20800798/tesla-model-3-rfid-chip-keycard-amiedd-video-watch-body-hacking-body-modification