MIFARE Yellow proximity key
Proximity keychain with MIFARE technology
The MIFARE proximity key fobs have a microchip built-in that, when it is brought closer to the reader, it emits a radio frequency signal that activates it. When the microship is activated, it returns an identification code to the system. In order for the system to allow you access, it requires a simple programming to adding that key to the memory.
These keys do not need to be powered, so they do not require a battery. Comes in yellow.
The MIFARE key communicates with the reader at a frequency of 13.56 MHz.