1. [Wifi + Bluetooth dual mode]: Connect faster with connection speed up to 2 times quicker than Wi-Fi only 2. [High and low temperature alarm]: When the set temperature threshold is exceeded, the device sends a notification to your phone 3. [High humidity and low humidity alarm]: When the set humidity threshold is exceeded, the device sends a notification to your phone 4. [Real-time monitoring]: Powered by 2 AAA 1.5V batteries (batteries not included), low power consumption. Based on default system settings, it can operate for approximately 1 year. Data update frequency ranges from 1 to 120 minutes, adjustable as needed. Shorter intervals reduce battery life 5. [Temperature and humidity curve]: Records temperature and humidity changes via the app and displays them in graphical format for intuitive review of recent data trends 6. [Temperature unit switch]: Sensor supports Celsius and Fahrenheit conversion. Select the preferred display unit as needed 7. [Third-party voice support]: Compatible with Alexa and Home Assistant. Access current temperature and humidity readings via voice commands Power supply: 2 x AAA 1.5V (battery not included) Wi-Fi support: 2.4G IEEE 802.11 b/g Temperature measurement range: -10C to 55C Temperature accuracy: 0.3C Humidity measurement range: 10% to 99% RH Humidity accuracy: 3% RH Color: Black Material: Plastic Package Contents: 1 x Wireless Temperature and Humidity Sensor Note: Light reflection and display differences may cause slight variations between the product color in images and actual product. Measurement error allowance is +/- 1-3 cm