Ordinary portable signal jammers generally use power adapters, and better-quality portable signal jammers use switching power supplies. You can select a battery to supply power to the jammer according to the output parameters of the power adapter or switching power supply. However, there are generally no batteries that can match exactly on the market, and the batteries generally need to be customized, or a voltage regulator module is used to provide a stable power supply for the mobile phone signal jammer. Or directly connect the battery to the inverter, let the inverter provide a stable 200V AC power, and then connect the power adapter or switching power supply of the mobile phone signal jammer through the power cable. Through the above two methods, the ordinary portable signal jammer can be transformed successfully. However, for well-known reasons, the size of the interference range of the portable signal jammer is determined by the following two factors. First, the transmission power of the radio frequency modules in each frequency band of the mobile phone signal jammer, under the same signal field strength, the transmission power The larger the value, the greater the shielding range of the jammer. Second, use the signal strength of the site. Generally speaking, the shielding principle of a portable signal jammer is the power suppression of white noise, which means that whichever device transmits the most power in this place will have the best effect. For example, the signal strength transmitted by the mobile phone signal jammer in this frequency band covers the signal strength transmitted by the base station, then it will show that the mobile phone signal in this frequency band will be shielded, otherwise, it will not be shielded. Therefore, while transforming the portable signal jammer, it is also necessary to consider whether the portable signal jammer can meet the interference requirements of the use site.