Is there no signal in the studio?

If there is no signal, there is usually a signal shielding in the detention center.

Cell phone signal shielding devices in detention centers can be seen everywhere in detention centers and prisons, in order to prevent criminals from taking photos with their cell phones and revealing some secrets.

When installing and using mobile phone signal shields in detention centers, it is mainly to select the area that needs to be shielded from mobile phone signals and place the mobile phone signal shields in the room walls or corridors in this area.