Features: 3.5-inch TFT HD Color Display: real-time display current time, date, CO2, 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 CO2, temperature and relative humidity. Simple Stylish Appearance: the air quality monitor has small size and clean design, perfect fit for house with any decorative style. Free-standing style, no mounting required. Wide Applications: suitable for using in the car, bedroom, living room, office, classroom, library, etc. Specifications: Material: ABS Voltage: 5V, 1A Detection Technique: Semiconductor sensing technology Test Function: CO2, temperature & humidity CO2 Test Range: 400~4000ppm Temperature Test Range: -9~55& 8451; Humidity Test Range: 0~100% Working Condition: -9& 8451;~55& 8451;,