This compact carbon dioxide detector monitors indoor air quality and gives clear, real‑time warnings so you can act quickly to protect health and comfort. Key benefits Realtime visual alerts: Flashes four warning lights when CO2 levels exceed 1999, providing an immediate, easy‑to‑see alarm for CO2 concentrations. Multiparameter monitoring: Builtin CO2 and TVOC sensing plus temperature and humidity readings give a more complete picture of indoor air quality and comfort. Continuous, convenient power: USB charging supports uninterrupted monitoring from common USB power sources (phone chargers, power banks, laptops). Portable and easy to place: Compact, lightweight design is simple to move between rooms, offices, classrooms, or medical spaces for ondemand monitoring. Practical gift: A useful, genderneutral present for anyone concerned about air quality — family members, coworkers, caregivers. What it solves Detects elevated CO2 that can cause drowsiness, poor concentration, or indicate inadequate ventilation. Identifies TVOC presence and tracks temperature and humidity so you can spot conditions that affect comfort and health. Provides an immediate visual warning so occupants can ventilate the space or take other corrective action right away. Key attributes Function: Measures CO2, TVOC, temperature, and humidity; alerts visually when CO2 exceeds the 1999 threshold. Compatibility: USB‑charged for use with standard USB power sources to enable continuous operation. Size and portability: Compact profile for desktop, shelf, or portable use — move it where monitoring is needed most. Performance: Designed to deliver accurate, real‑time readings and clear visual alerts for rapid response. Practical applications (examples) Home: Place in living areas, bedrooms, or nurseries to check ventilation and maintain comfort for family members. Office and classrooms: Monitor meeting rooms, shared offices, or classrooms to identify when ventilation or breaks are needed to maintain concentration and safety. Healthcare and care facilities: Use in waiting rooms, recovery areas, or staff spaces to keep track of air quality alongside routine infection‑control practices. Usage notes Plug into a standard USB power source for continuous monitoring and instant alerts. Position the detector at breathing height in the space you want to monitor for representative readings. This detector delivers straightforward, portable air quality monitoring with clear visual alarms and multi‑parameter sensing so you can understand and improve indoor environments.