With the rapid popularity of smartphones, I feel uncomfortable with the ringtones of mobile phones in cinemas, cafes, museums, and concert halls. There are many situations that cause inconvenience to others. Have bad behavior, such as cheating on a mobile phone at the test site. Produce unfair results. In addition, important information may be leaked in sensitive areas such as military bases and government agencies. It is also necessary to provide a comfortable environment for patients in the hospital. Using a cell phone jammer can prevent ringing and phone ringing on the phone, prevent canning, prevent the leakage of privacy and confidential information, and prevent radio noise.