Smart WiFi Control: Easily monitor real-time temperature from anywhere, anytime. With external waterproof temperature sensor probe, detects temperature range between -40C and +120C. The thermometer hygrometer is suitable for freezer, refrigerator, aquarium, incubators, etc. and detects water temperature. Works with Amazon Alexa, Google Home: After connecting Amazon Alexa and Google Home, you can know the current temperature humidity by voice. Backlit LCD display : 3" LCD display with backlight, making it easier to read in low light conditions Smart Message Alerts & Sound Alarm: Set up the temperature alarm range via the Smart Life app and the temperature will sound for 30 seconds and the temperature values will flash on the LCD screen to alert you when the temperature or humidity goes out of the preset value. Stay ahead of the air changes in your wine cellar, bedroom, greenhouse or home. Battery Option Backup: The sensor is powered by a DC5V1A power adapter and has a rechargeable battery as a backup battery that can be used for 6 hours after a power failure