The peripheral circuits introduced around ZigBee chip technology are called "ZigBee modules". Common ZigBee modules follow the international standard of IEEE802.15.4 and operate in the 2.4GHz frequency band. In addition, the European standard is 868MHZ, and North America is 915MHZ. Click to view all Zigbee module specifications of Tuya: https://developer.tuya.com/en/docs/iot/zigbee-module?id=Kaiuylhfmwnbs