Question about Eurochron EFWS 01001 WLAN weather station with 5 sensors

I would like to connect additional sensors to this betting station. Which ones are compatible? According to the description, the weather station works in the 868 kHz range. However, the Eurochron sensors have a frequency of 433 kHz. Are these the right ones or which item should I use? Thanks for feedback Eurochron EC-4406126 Item 12988421