3M™ EMS Caution Tape 7600 Series uses a new EMS marker technology embedded into a caution tape for installation near or above the buried facility. The markers require no batteries and there is no need to hook up an external transmitter or search for access points. The markers work independently, so even if a section of Caution Tape is cut or removed, the other markers on the tape continue to provide accurate location information. Easily identifiable by color, each version of 3M EMS Caution tape is tuned to a frequency specific to that utility (gas, telco, water or wastewater). It can be buried down to 2 ft (0.61 m), and is ideal for early detection/warning due to this low depth.