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Keep your private calls private. Tele-Data Guard™ prevents eavesdropping by detecting tiny changes in line impedance. If the green LED light goes out during a phone conversation, someone has activated a tap or picked up an extension. (You can press the by-pass button if you wish to continue talking.) If the light is off, you know an extension is in use before you pick it up. This prevents you from interrupting fax and modem transmissions. When Tele-Data Guard is installed on all of your extensions, the extension you pick up automatically disconnects the others. This means you don't have to run to turn off the answering machine. Installs in seconds between your phone and wall jack with standard modular connections. No batteries needed. 3.5" x 2" x 1". Click here for more information and price |