Nokta Makro Wireless Headphones Green Edition. The Nokta Makro wireless headphones have a wireless range of 10 meters at a frequency of 2.4 GHz. The headphones have a built in lithium-polymer battery for 14 to 20 hours of detecting. Charging Time: Approximately 3 hours.The item "Nokta Makro Wireless Headphones Green Edition IN STOCK" is in sale since Saturday, December 21, 2019. This item is in the category "Business & Industrial\Test, Measurement & Inspection\Test Meters & Detectors\Metal Detector Accessories". The seller is "mysports365" and is located in Grosse Ile, Michigan. This item can be shipped to United States.