E.F.F. (Empty Frequencies Finder) is a utility that lets you choose a range (only 87.5 FM - 108.0 FM) to scan from, for empty/unused frequencies, using the reciever of N900 and headphones as its antenna. For example you can use this utility to find empty frequencies, so you can easily transmit from your N900 to your radio. If you are not satisfied with the emptiness of the frequency scanning results you can select between modes, to find a better one.

The following are required to run the app:
- PR 1.3
- Headphones