If you really want to check, the best way is to check the signal. Metal detectors are unreliable, and there should not be too many metal objects in the classroom; How To Build A Cell Phone Blocker Kit will affect the signal outside the classroom, and students can download games or movies offline; suddenly turning off the lights will affect students who are studying normally; report anonymously, generally no response, no Good for class unity; mobile phone pocket on the wall, students will say no mobile phone or have two mobile phones or hand in a model machine. Moreover, all of the above methods are not conducive to fostering teacher-student relationships.
The effective shielding distance of the mobile phone signal jammer is the indoor distance. There are not many indoor obstacles, and there is a certain distance from the base station. Using a desktop multi-antenna How To Build A Cell Phone Blocker Kit indoors will improve the shielding effect. In an open outdoor area, there are not many obstacles, and the effective shielding distance can reach hundreds of meters. The effective working distance of the portable cell phone jammer has a certain relationship with the environmental conditions at that time, whether it is outdoors or indoors, so it is recommended to use a mobile phone jammer with a high output signal outdoors. Distance and location from the base station. Therefore, when using mobile phone signal shielding, this factor should be considered to avoid blind spot shielding and its impact on the shielding effect.