Filtrete 20"x25"x1" Smart Bluetooth Air Filter with MPR Rating 1500. This filter attracts and captures microscopic particles like bacteria, particles that can carry viruses, and large particles like mold spores and pollen. Its Bluetooth-enabled sensor pairs with the Filtrete Smart App to track filter life based on data from your home's HVAC system, ensuring optimal filter changes for proper HVAC system maintenance. Receive alerts directly to your smartphone when it's time to replace your air filter. Access information in the app to remind you of your specific filter types and sizes, making replacements easy. See outdoor air quality information for your neighborhood and other chosen locations. The Filtrete Smart App is available on iOS and Android.