FILTERSCAN WiFi 15 to 24VAC/DC AC & Furnace Filter Monitor with Text & E-Mail Alerts WiFi-enabled: Sends text and email alerts when you should change your filter Real-time air filter status reports available via AirFilterSentry Save energy, improve air quality, and help avoid HVAC system failers Selected Best of What's New in 2014 by Popular Science Magazine Powered by 15-24V AC/DC using installer-provided electrical conduit