Elephants often communicate with their trunks.
When danger lurks near, one elephant will raise its trunk to alert the troops. Despite the fact that the rest of the herd might be a half-mile away, they can still understand this signal. Depending on how advanced your business is, you may need only a few of these systems, or you may need all of them. Mediums Telephone Wire. Telephone wire is made up of one or more pairs of strands of copper wire twisted together.