One is a large exam and the other is long-term use in the classroom. For large tests, simply take it to the test room and connect. It only takes a few days, so you don't need to install a cell phone jammer for convenience and flexibility. Just take the jammer to the test room and connect it before you start testing. You can also place the shield on a chair or table to enhance the shield effect. The optimum distance from the ground is 1.5 to 2 meters. Of course, depending on the strength of the local wireless signal, it can be placed directly on the ground or in front of or behind the classroom for better shielding.
Use the jammer for a long time in the classroom. At this time, the jammer needs to be repaired in the classroom. There are two things to note here. The first is to place it at a height of 2.5 to 3 meters or higher. While pursuing improved shielding, it needs to be high enough to avoid damaging naughty students. It is better to put it in the middle of the classroom.