RF Guard

RF Guard is a newly-developed wireless anti-environment apparatus. It can terminate sending and receiving signals for all cellular phones within defined area, thus to protect noice pollution murged by cellular users in typical location such as  classrooms & labs, concert halls, Christian churches and any other places where silence is greatly needed.  Particularly, it ends communications of electro-magnetic waves, thus avoid risk of accidence such as in aeroplanes, CT/MRI rooms of hospitals or fuel-filling stations.  It's plug-in equipment with simple installation and no maintenance.