Editing TeleZapper (section)

== How it works ==
The TeleZapper is an appliance that plugs into a consumer telephone line. On detecting a ring and answer of any phone on the line, the Telezapper will immediately play a sequence of [[Special information tones]] or "SIT": one of eight internationally standardized signals that indicate a call cannot be completed. Typically the "Intercept" or "IC" SIT is used, indicating the number called has been disconnected or changed.

{{listen
|filename=IC SIT.ogg
|title=IC SIT
|description=Intercept tone played by The TeleZapper (2 times)
}}

By playing this tone signal on the line, a predictive dialer calling the household would hear it, assume the number was disconnected, terminate the call and likely mark the number as "disconnected" in its database.

This "tricking" of the telemarketer's equipment was effectively highlighted in marketing material for the TeleZapper as a way to get revenge on the "obnoxious telemarketers". The device is powered by a [[Button cell|CR2032 battery]], which is not documented in the manual and is replaced by opening the unit.