Applications: The model CPI2004 mobile phone jammer has been specifically designed for the following commercial and professional applications: 1. Conferences and business meetings 2. Work places and factory 3. Places of ship, train and bus 4. Public libraries, classroom and training center 5. Museum and gallery 6. Church, temple and masque 7. Theatre and concert hall 8. Bank, restaurant and jail 9. Places of public entertainment 10. Hospitals and where for the security purpose Installation: 1. To ensure the best performance, please kindly check in exact system frequency range when ordering 2. The best location for mobile phone jammer is on the vertical position, and try to turn to different positions for testing 3. If the power is turned on without attached the antennas, the jammer could take severe damage from the reflection power effect 4. The reflection time of jammer is around 10 - 20 seconds after it is turned on 5. The effective distance 20 me