Amano RFID Keyfob RFID Keyfob, Q: 10 All Amano electronics can use these RFID keyfobs instead of PIN numbers or RFID "credit cards." Our Price: $45.00

Amano MTX-30 RFID Employee Key Fob

Some of the Amano MTX30 clocks can use RFID Badges and RFID Key Fobs

Eveyone has a key ring, this is for them to carry.  It's a higher level of security.
Simply hold the key fob up to the MTX30 Proximity clock and it will register.
Reusable, and nearly indestructable. 
Lifetime guarantee.

Part number AMX-308200