WITH EXTERNAL PROBE & BACKUP RECHARGEABLE BATTERY: The room temperature monitor with an external temperature sensor probe, you can use it to monitor the refrigerators, fish tanks, incubators, greenhouses, storage tanks, guitar cases, etc. It powered by USB cable and built-in rechargeable battery which used as a backup battery can be used for more than 5 hours after power failure. We offer a 24 month warranty on Room thermometer for homeWIFI TEMPERATURE HUMIDITY MONITOR WITH DOUBLE ALARM: Connecting with 2.4GHz WiFi(No 5G support), you can remotely monitor the smart humidity sensor. You can set the upper/Lower limit of the alarm via Tuya/Smart life app. The wifi temperature sensor will sound an alarm and send a notification to your phone when beyond preset valueREAL-TIME UPDATE & CALIBRATION FUNCTION: This remote temperature monitor is equipped with exceptional microchip and a sensitivity sensor, support Real-time data update. Users can also choose the temperature or humidity report time, such as 1s or 100s.The digital thermometer for home with calibration function, the temp and humidity can be manually calibrated via the AppVOICE CONTRO & LARGE BACKIGHT SCREEN: The temperature and humidity sensor compatible with Alexa, Google Assistant. After connecting, you can know the current temperature humidity by voice. Thermometer WiFi is equipped with a 2.9in Backlit LCD display, allows you to check the readings in any dim situation. You can also turn off the backlight manually.HOME AUTOMATION: The Indoor Humidity Meter and Temperature Sensor can be linked with other Tuya smart devices, such as smart plugs, fans, etc.You can set a condition in the smart scene, for example, the air conditioners is turn on when the temperature reaches the limit value, or the dehumidifier in your room starts working once the humidity is over higher