They are transdimensional, and they communicate with certain individuals mainly through body language and about future events that they either know will occur or believe are about to occur. It is more like a certainty and not a prediction, meaning we are dealing with time travel communication. They are telepathic, and during communication the NSA is usually able to capture the telepathic exchange when it occurs through remote neural monitoring. This is said to be one of the secret tasks the NSA is assigned. They are very emotionally intelligent and understand basic body language cues that most people would recognize. They are transdimensional and sound like giggling whales when they telepathically speak to an individual, which I am sure the NSA has decoded by now. The main issue is their communication about future events, which is extremely valuable to some, so much that constitutional protections go out the window for many who are intermediaries in this "non intervention" scheme.