Tuya Zigbee/Wifi Temperature Humidity Sensor Indoor Thermometer Hygrometer~UK
Zigbee working frequency:2.400GHz-2.484GHz. 1 Temperature and humidity Sensor. Detection humidity:0-100%RH. Working humidity:maximum 95%RH. WiFi:802.11b/g/n 2.4GHz. You can preset the value of temperature and humidity for alarming from here.