Shield frequency's, it will be on a frequency such as 16GHz ect(I have no idea what I am talking about.) which will be omni-purpose and say a higher frequency for higher intensity and more damaging things such as like weapons which would normally destroy your shield instantly but then less damaging things have like a 1 in 10 chance of penetrating kinda like it makes the shield more unstable allowing things to penetrate easier if it does less damage that kinda thing.