WiFi Weather Forecast Clock Weather Alarm Wireless Outdoor Weather Sensor for Indoor 100‑240V US Plug Item Type: WiFi Weather Forecast Material: ABS WiFi Weather Forecast Power Supply: 3 x AA alkaline dry cell or solar power supply, without batteries. WiFi Weather Forecast Display Power Supply: 3 x AAA alkaline battery or power adapter, without batteries. Open Ground Transmission Distance: Approx. 100m / 328.08ft Frequency: 433MHz, 868MHz, 915MHz Temperature Measurement Range: -40℃ to +60℃, that is, -40℉ to +140℉. Temperature Measurement Accuracy: ± 1℃ Temperature Measurement Resolution: 0.1℃ Humidity Measurement Range: 10%~99% Humidity Measurement Accuracy: ± 5% Rainfall Measurement Range: 0-6000mm, display - - - - when exceeding the range. Rainfall Measurement Accuracy: ± 10% Wind speed Measurement Range: 0-50m/s, that is, 0-100mph. Display - - - - when exceeding the range. Wind Speed Measurement Accuracy: ± 1m/s when wind speed<5m/s. 10% when wind speed >5m/s. Lighting Measurement Range: 0-200K LX Lighting Measurement Accuracy: ± 15% Indoor Temperature Measurement Range: 0℃ to 50℃, that is, 32℉ to +122℉, display - - - - when exceeding the range. Indoor Temperature Measurement Resolution: 0.1℃ Indoor Humidity Measurement Range: 10%~99% Indoor Humidity Measurement Resolution: 1% Indoor Air Pressure Measurement Range: 700-1100hpa, that is, 20.67nHg - 32.5inHg. Indoor Air Pressure Measurement Accuracy: ± 3hpa Indoor Air Pressure Measurement Resolution: 0.1hpa, that is, 0.01inHg. Alarm Duration: 120 seconds after removing the product, install the machine according to the instruction manual and use it. The monitor can be turned on by simply installing the battery or connecting the power supply and long pressing the screen.