As the question does not specify the type of police scanner it becomes a bit more difficult to answer the question as to how to stop the beep of the police scanner in question.
The manual to the scanner should tell exactly how to disable the beep when pushing buttons on the unit.
If the manual is lost the manufacturer should be able to help. Many owner manuals are now available online especially for more recent products.
A local electronics store such as Radio Shack may have the owner manual available online or may have knowledge as to how to disable the beep.
Finally a search online in a search engine for your particular type of scanner may provide information as to how to find the manual or how to do what you seek to do.
follow the beep to the speaker up under the dash, unplugg it.
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Police scanner let's you listen to police radios and NASCAR scanners are scanners that let's you listen to NASCAR team chatter
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A police scanner, or police scanner radio allows you to listen to over the air communication. This communication rangs from police (most popular), fire and EMS to air traffic, race pit crews, businesses and more.
It depends on what state you live in if it's legal to have a police scanner in your posession. You need to call your local police station and ask them the law.
To DISABLE beep, you must unscrew and removed back plate of watch and place a piece of paper between back plate from coming in contact with battery. This will also disable alarm chime but will solve the annoying beeping sound. Hope this helps!
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Check your owners manual. If you don't have one copy & paste this link. http://www.genuineservice.com/genuineservice/en/gloveboxresults