This proximity ID token tag has characteristics of small appearance, not fade, waterproof, easy to carry, can be hung on the key, durable and long service life The 125KHz RFID card only can be read, and can not be reprogrammed or rewritten. If you want to add these tags to your lock as new key cards, please make sure that your lock uses the same frequency unencrypted ID key fob is made of ABS with stainless steel key ring The RFID ID card is widely used for identification, such as door entry access control system, residential property elevator and parking lot management, public transportation, hotel management, etc. Individuals cannot use it directly It needs to be entered into the system by the property staff or management staff and then activated to use Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.