Filtrete™ Smart pairs with your Filtrete™ Smart Air Filter to help you understand and manage your home's air quality. It provides useful tips and alerts customized to your home's environment, and will notify you when it's time to replace your filter based on air flow and usage - not just time. By pairing this app to your Filtrete™ Smart Air Filter, you can: - Track the life of multiple Smart Filters - Receive filter change notifications based on real usage - Remember your filter type and size - Easily order replacement filters - Monitor outdoor and indoor* air quality and view short and long-term trends - Receive tips and alerts to improve indoor air quality * Indoor air quality monitor sold separately.