NFC RFID CUID Gen1a Dual Chip 13.56MHz 125KHz MF Classic 1K T5577 for Proxmark3

Description

Dual-chip, UID-changeable RFID/NFC card for Proxmark3, access control, pentesting, etc.
The main photo is sort of boring, see the other photos for screenshots of the card in action.
This card features two NFC chips on one card.
One chip operates on 13.56 MHz and emulates a classic 1K, 4-byte-UID card popularly associated with a litigious manufacturer that likes to file complaints to eBay for naming their brand.  This chip supports the "Gen1a" Chinese Magic commands, to allow access to block 0 to rewrite the UID and other manufacturer specific data there.  This is a true CUID card, the UID can be changed repeatedly.
The other chip is a 125KHz T5577 style which can be used to clone popular 125K access-control cards from a variety of brands I won't list here lest someone whine.
!! NOTE !! This card CANNOT be UID changed using the popular MCT Android App.  You need to use a Proxmark3 or similar specialized tool.
You can write the user-accessible pages with MCT or other apps, but cannot change block 0.  And you cannot access the T5577 component at all from any phone I know of.
Hard glossy plastic, non-printable.
Message me if you want a specific UID written before shipment, otherwise you will get a random factory assigned one.  I am generally not going to accommodate more involved custom writing requests, but you can do that yourself with common tools.