it does have a cool white light
It is not programmable, at least not from the implant end.
It will blink, depending on how the reader that is presented reads.
Constant if the reader is is constantly on and pulse if it pulses…
What you want wont be available by Saturday, you need to decide if you want dual RFID functionality, or HF and blinky.
Then NExT will give you more things you can use it with, the xSIID will give you the ability to show off…
My opinion, the NExT is the better first implant, to interact with more things and use for projects.
Placement for the NExT is easy, in position #0
The xSIID you need to plan ahead and decide what else you want to get in the future