T-lock Outgoing Call Blocker w/ Allow/Restrict Memory and Cut-off Timer - Wallplate Style This discrete telephone box hides an electronic circuit that allows you (the owner) to retain full control of your phone line while imposing outgoing call restrictions. Call Off Timer function. This feature allows you to limit the length of calls to up to 49 minutes (adjustable). Cut off timer applies to incoming and outgoing calls. The Allow or Restrict memory can hold up to 40 records. You can add any combination of phone numbers, area codes and prefixes. Applications: Household with teens, Workplaces with unsupervised employees, Public Long Distance Telephone Booths (Call timer feature), Military bases (to Limit the length of calls), vacation homes, etc. 6 digit security code bypasses all restrictions. Works on DTMF landlines voice services and VOIP lines - Easy to install, program and use. One unit can protect all extensions. Line Powered (no batteries, no external power needed)