Item Type: Business HeadsetMaterial: ABSColour: BlackType: BinauralPlug Diameter: 2.5mmFunction: Call/ Adjustable Volume / Mute the MicrophoneScope of Application: Compatible with Landline Phones or Cordless Dect Phones with 2.5mm Headphone JackSpeaker Parameters:Sensitivity: 1053dB (At 178mV 1KHz)Voice Coil Impedance: 15015 (At 1KHz)Frequency Characteristics: 100Hz-10KHzDistortion: 5% (At 178mV 1KHz)Microphone Parameters:Directivity: Single PointSensitivity: -402dB2.0V, 2.2K, 1KHzDistortion: 5% (At 4.5V 2.2K 1kHz)Frequency Characteristics: 200Hz-6KHzCurrent Consumption: 100-500APackage List1 x Telephone Headset1 x ManualSome phones need to program the headset buttons for the headset to work properly.1With 2.5 mm jack is compatible with landline phones or cordless Dect phones with 2.5 mm headset jack. Filter out all unwanted background noise and pick up your voice loudly and clearly for clear conversations on calls. 2Using ergonomic design and staying comfortable with soft ear pads, no fatigue or pain after long time wearing, allows you to wear it comfortably for hours. 3Equipped with an adjustable headband and a very flexible microphone boom, can bend for all head sizes to relieve the pressure from the headset. 4With a noisecancelling microphone and inline volume control, you can easily adjust the speaker volume. Designed for users who handle a large number of calls. 5For professional use of business or other unified communications platforms that require a consistently excellent handsfree headset, such as call center agent, telecom marketing and sales, etc.