Are you talking about https://dangerousthings.com/ ?

I just got my first couple implants a couple months ago now. They're pretty great! My advice though, make you have a plan to actually use them in day-to-day life.

I have one tag as a clone as my fob to get into work, and another tag I use with my smart home stuff. My favorite is a sensor I have hidden behind the siding on my house that opens my garage.