Feature 1 [Noise Reduction] With high definition microphone, it can be twisted at will, the noise is smaller, the sound is clearer, and it can provide you with a clear conversation in a noisy environment. 2 [Lightweight And Comfortable] Ultra light design, soft ear cushions and flexible headband, comfortable to wear for a long time without burden, allowing you to concentrate on conversation. 3 [Easy To Use] Just touch the button to turn on, turn off the answer, plug and play, this telephone headset supports speaker volume adjustment and microphone mute, meeting all your daily needs. 4 [Ultra Durable] The headphone is made of high quality ABS material, the structure is sturdy, to ensure super performance, durable, and the long earphone cable allows flexible movement. 5 [Widely Applicable] Compatible with equipment with RJ9 headphone jack, with USB sound card, can also be used for equipment with USB interface, suitable for office, call center, customer service, etc.Item Type: Telephone HeadsetMaterial: ABSModel: H360D-RJ9-U900Color: BlackType: BinauralPlug: RJ9, USB Sound CardFunction: Call, with USB Sound Card, Speaker Volume Addition and Subtraction, Microphone MuteScope of Application: Compatible with Devices with RJ9 Headphone Jack, and Can Also Be Used with Devices with USB InterfaceSpeaker 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: -402dB (2.0V, 2.2K, 1kHz)Distortion: 5% (at 4.5V 2.2K 1kHz)Frequency Characteristics: 200Hz-6kHzCurrent Consumption: 100-500AApplication: Suitable for home, office, call center, telemarketing, customer service, teleconference, etc Package List1 x Telephone Headset1 x USB Sound CardNoteNo wire control function when using RJ9 plug.