7. Block all No Caller ID call
On Home screen, press and hold REJECT button until you see BLOCK NO CID.
All calls not showing caller id will be blocked.
To turn off, press and hold REJECT button until BLOCK NO CID disappears.
8. Screen Brightness
On Home screen, press and hold UP button until you see LCD on screen.
Press UP button to adjust brightness levels, then press HOME to set.
9. Setting time on Home Screen
Press and hold VOICE button until date/time line blinks
Use UP/DOWN button to choose number, press ACCEPT to move to next.
Press Home to save when done.
Screen time may not be accurate due to power fluctuations in the phone line.
10. Turn off SENTRY's ringer
On Home screen, press and hold DOWN button until you see DONE.
To turn on the ringer, press and hold DOWN button until you see DONE.
11. Using Basic Mode
Toggle VOICE button to OFF.
SENTRY now blocks callers on Black List only.
You can still block all No CID calls. Please refer to 7.
Common Problems
Getting Jammed and Reset
If you get no response from pressing buttons, the system is jammed. Please
reset SENTRY. Just unplug from and plug back to the TO LINE jack. Resetting
will not affect the saved data except for the screen time.
Caller ID not showing on my phone
While connecting in series, some phones (Panasonic and Uniden) can not
display caller id. Using Parallel connection will solve the problem.
Blank Screen
You may have inadvertently dimmed the screen.
Press and hold UP button for 3 seconds, release and quickly press the same
UP button a few times to see the change of screen, choose LCD 5 and press
HOME to save.
More Questions? Call SENTRY Support: 714.361.4615
e-mail: questions@plugnblock.com
For more information, please visit www.plugnblock.com
Need help?
Do you have a question about the Dual Mode Call Blocker and is the answer not in the manual?
Questions and answers
Does the device recognise a protentional sacammer?
The Sentry Dual Mode Call Blocker does not specifically mention recognizing potential scammers. It blocks callers on the Black List and allows the user to block all "No Caller ID" calls. It uses a White List and an Advanced Blocking mode with "Stop and Check," but it does not claim to detect or recognize scammers automatically.
This answer is automatically generated