1/2/4PCS Tuya WiFi Temperature Humidity Sensor With External Probe LCD Screen Remote Monitor Indoor Thermometer Hygrometer SmartDescription:Detect luminous intensityFree IOS & android APPWorking voltage: DC5VStatic current: 30mAHumidity measurement range: 0 ~ 100% RHTemperature measurement range: - 19 ~ 60 (28.5 ~ 42.8 )Temperature measurement accuracy: 0.3 Humidity measurement accuracy: 2%Brightness measurement range: 0 ~ 100%Charging time: 2 hoursBattery service time: 4 hours (fully charged state)Specification of built-in battery: 3.7v/500mah (used in power failure / power failure state)WiFi system: IEEE 802.11 B / g / N 2.4GHz (5g is not supported)Specifications:1. USB power supply, built-in 500mA battery, never power off and can be used after power failure;2. Clear visibility, 2.9-inch LCD display;3. Five displays (temperature, humidity, brightness, time and date)4. App monitors and sets the upper and lower limit alarms all the time; Effectively overcome the shortcomings of being unable to control at any time in the tradition;5. Intelligent turn off / turn on backlight / carry out point saving mode;6. Precise detection, real-time detection and one second detection;7. Support external temperature sensing line (optional)8. Support the random switching of temperature units ( f ~ C) to completely solve the different units in different countries;9. It is easy to install, fixed on the wall and placed arbitrarily on the desktop;Package Included:Wifi Temperature Sensor * 1USB cable * 1Temperature control line*1English instruction * 1