Multifunctional electronic device hooks to any telephone and produces a beeping sound audible to both parties. Great gimmick for informing unwanted callers or girlfriends that your phone is tapped for some nefarious reason. Use to fake out your buddies that the law is “on to the caper” you all pulled last night!
Also note that telephone monitoring devices without all parties knowledge may require this BEEPING ALERTER. This board level device requires 9 to 12VDC and is connected to phone system via a splitter jack. Circuit allows adjustment of "beep tone" duration and repetition rate. It automatically produces alerting "beeps" when phone is used.
|These are paper plans, requiring parts and assembly (also available as downloadable plans for roughly half the price).|