This is EM4100/4102 ,is Read-only, not programable,not HID!!!!

• Size:36*26*6.6
• Material: PVC
• Detecting distance: 3-10cm
• ID tag suitable for: 125KHZ EM4100/4102 card reader and reading
• Color: Red，Green，Blue，Yellow，Grey ，Black optional
  
• Compatible with all Door Entry system
• Easy to carry
• Water resistant
• Each comes with Key ring included
• No external power required.
• Brand new key inductive card for entrance guard system.
  

Package:

• 20pcs 125KHZ ID Key fobs
• Note: Mixed color means 4pcs red,4pcs green,4pcs yellow,4pcs grey,4pcs grey.