Sensitive: Electronic devices produce certain frequencies that may disturb other electronics that are sensitive to those frequencies. It doesn't matter if it's a household appliance or in an automotive application: sometimes a filter is required to prevent feedback through the wiring.
Hows it work? By preventing rearward flow of all current, and thus all frequencies produced by the device being powered, they "filter" that devices ability to interfere with your vehicle's electrical system.
Different: Ferrite rings are another common way to help reduce radio static / interference, but they only help reduce EMI that's being radiated out of a source and do nothing to reduce interference that's back-fed through wiring. If you've got major static issues and Ferrite rings haven't done anything for you - these will likely help.
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FILTERS: 2x Inline EMI Filters
WARRANTY: 1 Year
APPLICATIONS: With H11 Connections
SUGGESTED FOR: EMI/Interference within wiring
INPUT: H11 Female
OUTPUT: H11 Male