UID / CUID Black Ring

Don't like carrying your access card or key fob around? Copy the data to a ring and look great and never worry about forgetting your card or keyfob again! UID / CUID Changeable rings are used to duplicate Mifare Classic 1K access cards and keyfobs. These rings can be programmed with the Proxmark3, ACR122U or iCopy 3/8 devices.

IMPORTANT: There are two different types of rings that you can choose from:

Type 1: Normal GEN1 UID Changeable Rings:

• All blocks (including Block 0) can be re-written multiple times  
  
• Use ProxMark3 (Magic Chinese Guy function) or libnfc to change UID.
• Uses "backdoor" technique to change/rewrite UID.
• UID can be changed multiple times.
• Not suitable for MCT on Android (Mifare Classic Tool)
• Answers to Chinese magic backdoor commands (GEN 1a): YES 

Type 2: Special GEN2 CUID Tags:

• All blocks (including Block 0) can be re-written multiple times  
  
• Not easily detectable by a system with "anti-clone" feature
• IMPORTANT: Fob will die if an invalid Block 0 is written
• Use normal commands. eg. hf mf wrbl 0 B FFFFFFFFFFFF a473f601200804006263646566676869
• Answers to Chinese magic backdoor commands: NO

Specifications

• Material: Zirconia Ceramic + Epoxy Resin 
• Thickness: 2mm
• Chip: UID or CUID (select above)
• Frequency: 13.56 Mhz
• Colour: Black
• Induction Distance: 2-5cm
• Waterproof: Yes