Tuya WIFI Temperature And Humidity Sensor With 2.9inch LCD Display,Spec: Only Sensor 1. Tuya WiFi digital temperature and humidity sensor, no hub required 2. Built-in high-precision temperature and humidity sensors, quickly and accurately detect changes in temperature and humidity in the surrounding environment 3. USB charging, no need to buy batteries, energy saving and environmental protection. 4. The sensor has a temperature probe (optional), which can accurately detect the water temperaturetemperature and humidity of the fish tank. It is widely used. 5. The upper and lower limits of temperature and humidity can be set, and the alarm will be issued immediately when the temperature and humidity exceed. Specification: 1. Working humidity: 0~100%RH 2. Working temperature: -19~60 degrees Celsius (-2.2-140 degrees Fahrenheit) 3. Temperature measurement accuracy: +-0.3 degrees Celsius 4. Humidity measurement accuracy: +-2% 5. Brightness measurement range: 0~100% 6. Working voltage: DC 5V 7. Static current: 30mA 8. Battery specification: 3.7V500mAh 9. Charging time: less than or equal to 2 hours 10. Built-in battery life: less than or equal to 4 hours (full charge) 11. Temperature probe: 1 meter 12. Wi-Fi standard: IEEE 802.11 bng 2.4GHz 13. Dimensions: 86 x 86 x 22.8mm