The Radio Frequency Filter is intended to filter out radio frequency interference which occurs in certain locations.

The armored cord of the payphone sometimes acts as an antenna which can attract radio frequencies. This device eliminates radio frequencies.

Features:
- Filters most Radio Frequencies from the telephone line.
- Telephone line passes through it before entering telephone device
- Plugs into any standard RJ11 phone cord or connector.
- Compatible with any Telephone or Telephone Line.