Earbuds are Crafted With Sustainable Materials Like Bamboo And Regrind Silicone.Frequency Range: 20 Hz - 20 kHzImpedance: 16 OhmActive noise cancellation: YesCharging Time (Hours): 2.0Weight (g): 68.0Microphone: YesColour: BlackColour: NaturalType: True Wireless In-EarOriginal Colour by Producer: BlackMade in: China: 20210315.0Battery Operation: YesType-A Connector: USB CConstruction Method: Closed.