Are the jammers installed in French prisons any different?

Most signal interceptors are produced in Asia, for example in Mumbai, India. So what's the difference between jammers installed in prisons?

Topsignaljammer  2022.3

North Korea's use of high-power GPS jammer has made such products frequently appear in major media. So what does this thing do, and what other things we don't know about it? Common GPS jammers 1. First of all, it is illegal to use GPS jammers in the United States, and it is also restricted in Europe. It is not clear whether there are relevant laws in other countries. 2. This GPS jammer is easy to order from the Internet, with functions such as protecting personal privacy and preventing others from being tracked. The lowest price online is only $33 (about 216 yuan). 3. Some people say that GPS jammers are dangerous goods.