Features: 3.5-inch TFT HD Color Display: real-time display current time, date, oxygen, temperature and relative humidity. The screen has wide viewing angle that can reach 160°, which is very easy to read. Data Logging Function: with up to 65,534 groups maximum storage management space, convenient for browsing the historical data saved by the system. Semiconductor Sensing Detection Technology: monitoring air quality in your surrounding with highly accuracy, real-time detect O2, temperature and humidity. Simple Stylish Appearance: the air quality monitor has small size and clean design, for house with any decorative style. style, no mounting required. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Wide Applications: suitable for using in the car, bedroom, living room, office, classroom, library, etc. Specifications: Display: 3.5-inch TFT HD Color Display Data Storage: 65534 groups Power: 3000mAh lithium battery Temperature Test Range: -9~55℃ Humidity Test Range: 0~100% O2 Test Range: 0~30% Working Environment: -9~55℃ Less than 90%RH Color: As shown Material: ABS Package Contents: 3 x O2 Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.