- Advanced display: The device features a 2.8-inch color LCD (320x240) for clear, at-a-glance readings of ozone levels, plus temperature, humidity, and battery status. - Alarm threshold: Set a customizable O3 alert; when elevated levels are detected, a warning is triggered to prompt quick action. - Upgraded sensor technology: Electrochemical O3 sensors provide accurate readings; built-in temperature and humidity sensors give full air‑quality context; self-calibration maintains reliable performance over time. - Micro USB charging: Recharges via standard micro USB; a low-battery alert helps ensure the monitor stays ready when needed. - Compact and practical: Handheld, portable design suitable for home, office, or travel; compatible with USB power banks and standard chargers for extended use. - Use scenarios: Monitor indoor air at home or in a garage; maintain safe conditions in offices, classrooms, or labs; plan outdoor activities or field work with USB charging for longer sessions.