The mobile cell phone jammer will be your trustworthy and loyal defender, providing you with a safe and quiet space! The National Security Agency is the National Security Agency’s Scientific and Technological Achievement Appraisal Committee, the Information Security Evaluation Center of the Chinese People’s Liberation Army, the National Explosion-proof Electrical Product Quality Supervision and Inspection Center, and the National Product Quality Inspection Center for Small Jammers. , Electronic Product Quality Strict Inspection Center, Electromagnetic Leakage Inspection Center issued and issued corresponding certificates. So jammer-shop is a very professional shop. I like its suppressor to shield the mobile phone signal jammer of GSM and CDMA mobile phones. The GSM mobile phone interference performance of CDMA mobile phones is much better, so the signal interference of CDMA mobile phones is effectively shielded less than that of GSM mobile phones. 3G/4G mobile phone jammers. Due to the difference, the distance reaches about 20-40 meters. Welcome to ask questions about mobile phone jammers.