The effective shielding area of ​​the signal jammer is different in different usage scenarios. This is closely related to the signal field strength on site. Cell phones with different standards may not necessarily have the same shielding range in the same location.
https://www.greatjammer.com/

 

www.greatjammer.com

Signal Jammer for Sale High Quality Frequency Blockers Electronic Jammers Online Shop

Here the signal jammer devices are sold at a conscientious price, and they are all high-standard quality-assured wireless jammers and jammers of different frequencies.