1/2/4PCS Tuya WiFi Temperature Humidity Sensor With External Probe LCD Screen Remote Monitor Indoor Thermometer Hygrometer Smart Description: Detect luminous intensity Free IOS & android APP Working voltage: DC5V Static current: 30mA Humidity measurement range: 0 ~ 100% RH Temperature 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 hours Battery 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 * 1 USB cable * 1 Temperature control line*1 English instruction * 1