* Operation Frequency: 125KHz

* Detecting distance: 3-10cm.

* Water resistant

* Each tag comes with a key ring

* Each tag has been pre-programmed with aunique ID（can not be change）, which is printed on the back.

* These tags come with a unique 64-bit ID which is laser etched on the back.

Package: 50PCS RFID Proximity ID Card Token Tags Key Fobs Keyfobs