There are a lot of RFID cards available and Every RFID card works on a certain frequency. The available frequencies are:
- Low frequency: These chips operate at 125 KHz.
- High frequency: These chips operate at 13.56 MHz.
- Ultra high frequency: These chips operate at 860 to 950 MHz.
The RFID readers in the Smappee charging stations are compatible only with the High frequency (13.56 MHz) range.
Therefore, the Smappee charging stations are only compatible with RFID tokens that use that range. If you use an RFID token operating on low frequency or ultra high frequency, these will not be compatible with Smappee charging stations.