Feature:1. This office phone headset with a 2.5 mm jack is compatible with fixed telephone or cordless Dect phones with a 2.5 mm headset jack.2. This binaural noise-canceling headset is very suitable for noisy environments and users who need to answer a lot of calls every day.3. It can filter unnecessary background noise and pick up your voice loudly and clearly, and the caller will hear a clear voice.4. You only need to insert the 2.5 mm plug into the headset port of the phone, which is easy to operate.5. The lightweight, ergonomically designed headset ensures that the phone headset can be worn comfortably throughout the day.Specification:Item Type: Business Headset.Material: ABSModel: H600D-2.5Colour: BlackPlug type: 2.5mm / 0.1inSpeaker Parameters:Sensitivity 1053dB (at 178mV 1KHz)Voice Coil Impedance 15015 (at 1KHz)Frequency Characteristics 100Hz-10KHzDistortion 5% (at 178mV 1KHz)Microphone Parameters:Directivity Single DirectionSensitivity -402dB (2.0V 2.2K 1KHz)Distortion 5% (at 4.5V 2.2K 1KHz)Frequency Characteristic 200Hz-6KHzApplicable Equipment: Landline Phone or Cordless Dect Phone with 2.5mm / 0.1in Headphone JackPackage List:1 x Headphone1 x Manual