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The 3M™ Marker Balls allow for the easy marking of underground communications/CATV lines buried at a distance of 5 feet (1.5 meters). Marker balls have a unique self leveling feature, that insures the marker is always oriented to the surface, allowing for an accurate location. Like passive markers, iD markers provide accurate identification of buried communications/CATV lines, helping to reduce the risk of accidentally excavating other buried facilities. iD Markers can be programed to include customer-specific information, such as the facility owner, conduit size, placement date, and other important details. This information can be accessed and changed by 3M™ locators with the iD function. This can all be done without the need for an external power connection. It also has a water resistant polyetheline shell, which is impervious to minerals, chemicals and the temperature extremes normally found underground.