The portable Signal Jammer can selectively turn on different frequencies according to different use scenarios. The portable trailer type and vehicle mounted jammer can quickly replace the module, but the jammer is not replaced arbitrarily when replacing the RF module. The following points should be paid attention to：

First, before replacing the RF module of the portable signal jammer, be sure to power off first. Although the host equipment has done enough safety protection measures, when replacing the RF module, be sure to power off first to ensure safe operation and avoid personal injury, and also to protect the portable signal jammer.

Second, when removing and replacing the RF module of the portable signal jammer, pay attention to the sequence. First screw the connecting feeder off the RF module with the help of a wrench, then screw down the screw fixing the RF module, and then pull the RF module out of the host. During the pulling out process, pay attention to the appropriate force, and then insert the RF module to be replaced into the module bin, paying attention to the direction of the module, In addition, the power supply interface of the host module should be corresponding to the power interface of the module. Remember not to use brute force before corresponding, then fix the module screw, and finally screw on the feeder.

Finally, after replacing the RF module, the portable Signal Jammer should not rush to supply power. First check whether the frequency of the original RF module is the same as that of the replaced module. If the frequencies of the two modules are different, the corresponding antenna needs to be replaced, otherwise the RF module and antenna may be damaged to avoid unnecessary losses and affect the normal use of the jammer.