Implant types
So you want to be a transhumanist grinder? These are some implant types you might consider.
ID
The following are transponders.[1]
Read-only RFID
Responds to any reader that creates an RFID field, it will return a long ID, suitable for identification purposes.
Similar a finger print reader, except you have to remove the chip rather than burn off your fingerprints.
Rewritable RFID
As above, except you can rewrite the chip to display a different ID from time to time. (Limited amount of rewrites?)
Compute
NFC Chips
Passively powered as before. Can hold a bunch of custom data and has some compute ability such as password protection.
Compatible with NFC smart phones. Shiny
The next gen are are smaller https://dangerousthings.com/shop/flexdf/
You can stick them on your nails rather than implant them. https://dangerousthings.com/shop/nfc-nails/
Senses
Magnets
How do they work?
Temperature
It's getting hot in here.[2]
Aesthetics
Lights
There's a few options here[3]