The New Tele-Data Guard keeps your calls private.

If during a phone conversation the green light goes out, someone has activated a tap or picked up an extension.
Press the red button to resume talking, now with caution.
When Tele-Data Guard is installed on all your extensions, the extension you pick up automatically disconnects the others!
No more running to turn off the answering machine.
LED also tells you before you pick up if the line is in use.
Like a mini-phone system, protecting your faxes or modems from interruption, saving you steps, and insuring your privacy.
Measures just 3-1/2"x2"x1" and requires no batteries.