Feature: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 HeadsetMaterial: ABSColor: BlackType: MonauralPlug: USB PlugFunction: Call, Speaker Volume Adjustment, Mute, Microphone MuteScope of Application: For Devices with USB portsSpeaker Parameters:Sensitivity: 1053dB (at 178mV 1KHz)Voice Coil Impedance: 15015 (at 1KHz)Frequency Characteristics: 100Hz-10KHzDistortion: 5% (at 178mV 1KHz)Microphone Parameters:Directivity: Single PointingSensitivity: -402dB (2.0V, 2.2K, 1KHz)Distortion: 5% (at 4.5V 2.2K 1KHz)Frequency Characteristics: 200Hz-6KHzCurrent Consumption: 100-500A.Package List:1 x USB Business Headset1 x Instruction Book