[tommit]

Weren't these already using ZigBee? Does anyone know whether the Flipper can handle those frequencies as well?

[mehdix]

ZigBee, Thread and a few others use IEEE 802.15.4 which allows three bands: 868/915/2450 MHz. According to the FlipperZero homepage, it supports two out these three bands: 868 and 915 MHz. So depending on your device, it might work with them too.