Features:QD 2.5mm connecting cable, used to connect with the headset of the same specification interface brand, making the headset suitable for use in cordless telephones, or equipment with 2.5mm standard plug.Quick disconnect QD adapter to 2.5 mm plug;Be used with cordless or cell phones which have a 2.5mm headset plug;Reinforced cord for a strong and lasting performance.Built-in reinforced cord will protect headset against office chair wheels, for sharp objects on daily use. Specifications:Material:PVCColor:BlackPlug:2.5mmImpedance:150Wire Length:Approx.70cm/27.56inFrequency Range:200-6000 HzSensitivity:126 dB Note:Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1x 2.5mm plug to QD Adapter Cable