The 125KHz RFID Tag - Key Fob are considered passive tags. Each of these have a unique ID, so multiple tags can be used in a single project and may be purchased in any quantity.
• Works with most common RFID Card Reader (Serial and USB)
• EM4100 family passive tags
• Activating frequency: 125 kHz
• Readable from 2 to 5 inches of RFID reader
• RoHS Compliant
• Keychain tag for attachment
10pcs x RF Tag 125 khz