The higher the power of the cell phone jammer, the better the effect, but this is not the case. For example, if a space is about 400-500 square meters, it is necessary to choose a mobile phone signal jammer that shields about 600 square meters. It's not that the greater the power, the better. After all, the power of the mobile phone signal jammer has a safe power range. Some customers said why most of the merchants’ machines have poor shielding effects when the signal source is very close, while some merchants have very good results. In fact, the poor signal shielding effect when the signal source is close actually proves that these The business is a legitimate business. To comply with safety is the power range. On the contrary, when the signal source is very close, the shielding effect is very good, and the power is good. It is good to pay attention to these machines, because such machines have exceeded the safe power of normal use. Not only will it affect the upstream signal source, but there are also security risks, so customers who purchase should pay attention. Therefore, the power of the mobile phone signal jammer is not as large as possible.