Use AAA'3pcs, batteries are not included. The battery life depends on the time interval you choose, usually, it can last for several months, if we choose 120 minutes of updates. Display time and date after connecting with internet. There are that users can add our device to the smart life application using the app: bluetooth or wifi or hotspot. Product Description Model: Wi-Fi temperature and humidity sensor Type: Digital -Hygrometer Accuracy class: 0.1 Temperature measurement range: -10°C~55°C (°C) Humidity measurement range: 10%~90%RH (RH) Temperature measurement accuracy: ±0.5°C (°C) Humidity measurement accuracy: ±5%RH (RH) Battery used: LR03-1.5V/AAA Input voltage. DC4.5V LR03 x 3 Quiescent current: ≤30uA Low power undervoltage: ≤2.7V WiFi: 802.11b/g 2.4GHz Working temperature: -10℃~55℃ Working humidity: 10%~90%RH Color: White Material: plastic Package Contents: 1 x Temperature and humidity detector 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 1. The temperature and humidity report time can be from 1 minute to 120 minutes. The higher the frequency , the faster the battery will be consumed. 3. The humidity sensitivity value is 6%. When the humidity value changes more than ±6%, the temperature and humidity can identify and synchronize the data. You can remotely check the temperature and humidity through the application on your smartphone, tuyasmart or smart life. 5. Work with , Assistant. 2. The temperature sensitive value is 0.6°C. When the temperature value changes more than ±0.6°C, the temperature and humidity can be identified and the data will be synchronized. 4. Temperature unit selection in APP, You can choose ℃ or ℉ as the temperature unit. You can choose ℃ or ℉ as the temperature unit through the app.