Features:
– Featuring feeds from around America, Canada, and Australia
– Conveniently organized feeds list
– Save your 5 favorite feeds for easy access
– A large map to view the area
– Quickly search locations of calls on the map
– Police codes
– Background listening
– Mini-feed player
– Alpha Tags let you see which channel is playing
– Full screen and high resolution retina display support
– Built in volume controls
– Quickly start listening to the last feed you were playing when restarting the app
– Alpha tag alerts so you can see what channel is active even when not in iScan
– Ability to add custom feeds

Compatibility: OS X 10.11 or later, 64-bit processor

More info - https://itunes.apple.com/us/app/iscan-police-and-fire-scanner/id406433704