In their purest form, walkie-talkies are required to be registered and cannot be used by anyone who do not belong to the amateur radio category (due to too wide a range). But, if it is connected to a computer, you can disable all bands other than LPD or PMR, allowing you to use it as a walkie-talkie. But, you can only block the range for the radio that it came with. This will not be successful for fakes. You can tell whether something is a fake by going to menu item 38 (ponmsg) and selecting "MSG." When turned on, if the radio displays the words "YABAO UV-9A," then it is a knockoff. I found a lengthy list of external signals that can be used to determine the authenticity of a product on YouTube. Read the additional comments on the reviews before making a purchase on AliExpress because of this. The majority of people start by leaving a positive review, and once they understand they were tricked into giving it, they are unable to change their rating; the only option left is to add an angry addendum to it. A vendor with a very good rating and a warehouse in Hong Kong is the one who is peddling these knockoffs.
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