Features12.9 inch LCD Screen: With a 2.9 inch LCD screen, the five data (temperature, humidity, brightness, time, date) values are clearer. 2APP Monitoring: APP whole process monitoring, built in speaker, set the upper limit, lower limit alarm, when the set upper and lower limits will be immediately alarm prompt. 3External Probe: Support external probe (not included), accurate temperature detection, can detect ice temperature, refrigerator temperature and so on. 4High Accuracy: More accurate measurement, built in high accuracy digital temperature and humidity sensor, even 0.1 DegreeC even small changes can be sensitive to catch. 5Applicable Scene: Wide application range, suitable for indoor, cold storage, refrigerator and other scenes.SpecificationItem Type: WiFi Humidity Temperature SensorMaterial: ABSWorking Voltage: 5vStatic Current: 30mAHumidity Measurement Range: 0-one hundred percentRHTemperature Measurement Range: - 19 to 60 (- 2.2 to 140)Temperature Measurement Accuracy: 0.3cHumidity Measurement Accuracy: 2%Brightness Measurement Range: 0-one hundred percentCharging Time: 2 HoursBattery Life: 4 Hours (fully Charged)Specification of Built in Battery: Lithium Battery 3.7v 500mah (shipped with Built in Battery)Wifi Standard: IEEE 802.11 b/g/n 2.4GHz (not Supporting 5G)Weight: Approx. 158g / 5.6ozPackage List1 xWiFi Humidity Temperature Sensor 1 x Usb Cable 1 x User Manual 2 x Screw 2 x Expansion Rubber Plug