WiFi Temperature Sensor Tuya Thermometer Detector Digital Display Home Smart Life App Alert Freezer Water Alarm US Plug 1. Built-in rechargeable battery: Can be powered by external DC5V power supply or standby battery. (Note: If using backup battery, open the back cover and switch on the detector.) 2. Temperature unit is optional (Celsius or Fahrenheit). 3. Check temperature history records at any time. 5. Multi-user supervision supported: Share the device with other users via the app. 6. Built-in buzzer: Sounds an alert when the detector is triggered. 7. App: Download by searching for Tuya Smart or Smart Life; supports Android and iOS smartphones. Plug Type: US Plug, compatible with Canada, India, Mexico, Thailand, Taiwan, the Philippines, and other regions using US plug standards. Voltage: AC100-240V Color: As shown Material: Plastic Package Contents: 1 x Tuya WiFi Temperature Sensor Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.