3M Ball marker has a unique self leveling feature, that insures the marker is always oriented to the surface, allowing for an accurate location. This durable, easy to use ball marker in orange, functions without the need of an external power source. The ball marker is suitable for telecom and CATV/communications industry. The water resistant polyethylene shells are impervious to minerals, chemicals and the temperature extremes normally found underground. Ball marker is RoHS compliant.