cell phone signal jam mer with 8 bands 2g 3g 4glte mobile phone signal block er with wifi 2.4g used in indoor, Silver

examination room conference room chamber signal jamm er,conference room test room wireless signal shielding device even the most advanced tracking, eavesd ropping, wiretapping and other anti privacy technologies are unable to work properly when they are in the working range of this product it can be applied at meeting rooms, conference rooms, museums, galleries, theatres, concert halls, churches, temples, restaurants, classrooms, training centers, factories, banks, trains, bus and more places that require silence, confidentiality and information security.syi