Clear LCD Display: Features an easy to view screen showing current air readings and present measurements with 50% better visibility than standard devices, allowing straightforward environment checks for all users Long Battery Life: Powered by efficient rechargeable cells offering 30 hour continuous use with USB charging capability, minimizing power disruptions for placement in various locations Alert Function: Includes immediate visual / sound notifications when detecting unsafe levels exceeding standards, enabling fast action for families with children / older adults and workers needing continuous environment tracking Comprehensive Air: This advanced, particle and CO2 monitor uses accurate sensors to track PM2.5, CO2 and sound levels in real time with ±1% deviation, providing useful data for home and workplace environments Multiple Application Scenarios: Perfect for bedrooms, schools and commercial spaces, this monitor helps people assess and improve living / working environments, beneficial for parents focused on household wellbeing and supervisors emphasizing workplace conditions, Manufacturer: ZEPFJHE