Ensure you breathe clean and safe air with our innovative air quality monitor. Although air is essential to life, its quality can impact both body and mind. As air is unseen, having a reliable way to measure its quality is crucial. Our air tester offers you that peace of mind by continuously monitoring the air you breathe. Features: 2.8" vibrant color liquid crystal display (LCD) with a resolution of 320 x 240 pixels. Customizable alarm thresholds for ozone (O3) to alert you to elevated levels. Versatile use for office, indoor, outdoor, and ozone residue detection after disinfection. High-capacity 2000mAh lithium battery for extended use. Built-in fan for efficient air intake, ensuring precise and real-time readings. Convenient micro USB charging with low battery notification. Equipped with electrochemistry sensor for O3, plus temperature and humidity sensors. Provides AQI for ozone concentration index. Supports time, date, and self-calibration functions for added convenience. Compact design with LCD screen showcasing all on-board parameters clearly. Designed with a USB charge port for hassle-free usage. Comes with a storage box for easy transportation. Specifications: Material: ABS Color: Black and Orange Screen Size: 2.8 inches O3 Concentration AQI Interpretation: 0~0.100: Fine 0.100~0.300: Slight 0.300~1.000: Moderate 1.000~4.999: Serious Battery: 2000mAh lithium, included Item Dimensions: 164 x 74 x 26mm (6.5 x 2.9 x 1.0 inches) Package Dimensions: 280 x 225 x 70mm (11.0 x 8.9 x 2.8 inches) Package Weight: 501g (1.1lb) Packing List: 1 x Air Quality Detector 1 x USB Cable 1 x User Manual 1 x Storage Box