What is the effective jamming range that should be paid attention to when buying a jamming signal device?

The effective shielding range of the jammer mainly depends on the following points: 1.the power of the machine itself. 2.The density of base stations near you. 3.field wall environment. What is a field wall environment? It is the place where you install the shield, whether it is a cement wall or a glass partition.
Based on the above, the shielding range of the mobile phone signal jammer is not determined by a single factor. It is recommended that before buying in large quantities, the best way is to use a field wall meter to test the signal strength of your installation environment. The other is to buy several machines with different powers and test them to see how they work.