Ever noticed that slapping a case on your iPad somewhat restricts its 3G signal? That’s because your iPad is equipped with a clever proximity sensor that reduces the power of its 3G sensor by as much as 75% when it detects your device is close to your body, thereby reducing your exposure to harmful radiation.
Unfortunately the sensor isn’t clever enough to work out the difference between your body and a protective case, so as soon as it comes into contact with a case its 3G signal is restricted. However, this particular case from Pong Research not only prevents your iPad from limiting its 3G signal — giving you faster, more reliable data — but it also redistributes its radiation away from your body.

