A cell phone jammer that can block the radio waves of the cell phone. The shielding instrument should be placed in a well-ventilated place and avoid large objects being blocked to avoid extremely high heat and strong electromagnetic sources. Its shielding effect and long-term stability are guaranteed. Other items cannot be stacked on the antenna, because it will affect the disassembly and shielding effect, so the shielding work will not damage the machine. 4G radio circuit breaker The screen should not be turned off immediately during use, so as not to affect the normal operation of the phone. When using mobile phone jammers outdoors, the precautions must be waterproof. If the area is larger than the effective area of ​​the mask used, it is recommended to use multiple battery covers to ensure the shielding effect. For the power supply, the antenna is dedicated to support the host, and the factory is the antenna for debugging and debugging. Please try not to use each other to ensure that the mobile phone jammer achieves the best effect.