Cell phone signal jammer blocker can effectively block the cellular phone signal when it is necessary. It is common to see it in the examination room to keep the order and quiet there. With the increasing amount of people’s misuse of mobile phones, cell phone signal jammer is widely used in public usage. Like in the hospital, in the cinema, in meeting rooms or in some private partings, etc. One side, it can successfully block the cell phone can noises when you need peace, what is more, it is without any doubt the best choice to control cell phone playing time.