Features: 1.ENC Noise Reduction: This USB telephone headset has a built in HD microphone that can be twisted at will to provide clear conversations and reduce noise. 2.Soft and Comfortable: The single sided ear headphone features an ultra lightweight design with soft ear cushions and a flexible headband that won't weigh down your ears. 3.Multifunctional: The USB communication headset uses USB plug; plug and play, no driver required, easy to use. Supports speaker volume adjustment, mute, and microphone mute. 4.Sturdy and Durable: The office headset is designed with rugged construction and materials, and the long headset cable provides flexibility for mobility and durability. 5.Application: Monaural headset is suitable for devices with USB port. Such as home, office, call center, telemarketing, insurance, customer service, teleconferencing, etc. specification:Item Type: USB Business Headset Material: ABS Color: Black Type: Monaural Plug: USB Plug Function: Call, Speaker Volume Adjustment, Mute, Microphone Mute Scope of Application: For Devices with USB ports Speaker Parameters: Sensitivity: 1053dB (at 178mV 1KHz) Voice Coil Impedance: 15015 (at 1KHz) Frequency Characteristics: 100Hz-10KHz Distortion: 5% (at 178mV 1KHz) Microphone Parameters: Directivity: Single Pointing Sensitivity: -402dB (2.0V, 2.2K, 1KHz) Distortion: 5% (at 4.5V 2.2K 1KHz) Frequency Characteristics: 200Hz-6KHz Current Consumption: 100-500A PackageList: 1 x USB BusinessHeadset 1 x InstructionBook