The purpose of the Cellsafe case is not to reduce the strength of transmitted RF signal that comes from the phone, but rather to redirect and redistribute it away from the users head. When you're on a call, the mobile phone emits RF energy in all directions, 360 degrees from the antenna with a significant percentage of this being absorbed into your head.

The Cellsafe the case uses a special design of an embedded and purposely designed directional antenna inside the specially formulated silicone case, the combination of these two interact with the phone's antenna and redirect the transmitted RF signal away from the head of the user and out through the back of the phone. The aim is to significantly reduce the amount of radiation absorbed into the head of the mobile phone user. What's more, as the phone changes frequency bands and power levels, the Cellsafe case will adjust accordingly to the increased or decreased radiation level.