Feature:1. Compatible with landline phones or cordless phones with 2.5 mm headphone jack. Unnecessary background noise can be filtered, and your voice will be picked up clearly, and the caller will hear a clear voice.2. Equipped with a noisecancelling microphone and volume control, the headset provides clear sound quality, and you can easily adjust the speaker volume according to your need.3. The ergonomically designed headphones ensure that it can be worn comfortably all day. Equipped with adjustable headband, very flexible microphone boom can be selected according to your preferences.4. This 2.5mm mobile headset is specially designed for users who handle a large number of calls, such as call center agents, telecom marketing and sales, etc.5. Suitable for users in noisy environments, and those who need to pay full attention to phone, distraction will decrease, and productivity will increase. Cover both ears to help users concentrate more on phone calls.Specification:Item Type: Business HeadsetMaterial: ABSColour: BlackType: BinauralFunction: Call/ Adjustable VolumeScope 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: 100-500A.Package List:1 x Telephone Headset1 x ManualNote:Some phones need to program the headset buttons for the headset to work properly.