In schools, students want to study safe and quiet, but many schools have the same problem, more and more students are using their mobile phones while ..
Sometimes I ignore my own feelings. It doesn't feel private enough during a meeting. When it comes to cell phone jammers, there are a few things to co..
Usually, you will see the call drop. It's hard to enjoy your time. I want to eat a meal or drink coffee and study quietly. Someone did start speaking ..
Where electronic products are not required or rejected, you may encounter trouble because electronic products are not timely. For example, in a quiet ..