SK-04E cell phone signal blocker is the latest information security product, it can form an electromagetism protection field around the user, thus prevent mobile phone from receiving and transmitting the mobile signals to the base station; thus it can prevent the secret information leakage through your mobile phone, and also elininate the noise pollution. The model cell phone blocker for completely stopping all mobile phones operating on the CDMA, GSM, DCS, 3G bandwidth, and it can be adjusted the jamming strength depending on different demands. The cell phone blockers are now a necessity for law enforcement and the military to interrupt communications by criminals and terrorists, and also for accomplishing a more cultured society.