Feature:1. Noise Cancelling: Telephone headset with flexible high definition microphone for large, clear sound. Less noise, even in noisy environments, provides clear conversations.2. All Day Comfort: Phone headphone is ultra light, with soft ear cushions and a flexible headband that will not put any burden on your ears. Good for long conversations.3. Easy To Use: Wired telephone headset, standard RJ9 plug, plug and play, no driver required, easy to use, suitable for VOIP phones, landline, etc, to meet all your daily needs.4. Durable Structure: Unilateral headset has a sturdy structure and materials that ensure excellent performance and are durable. The long cable provides flexibility on the move.5. Compatible: The headset works with devices with an RJ9 headphone jack. Ideal for home, office, call center, telemarketing, customer service, conference calls and more.Specification:Item Type: Telephone HeadsetMaterial: ABSModel: H390 RJ9Color: BlackType: Single EarPlug: RJ9Function: CallScope of Application: Compatible with Devices with RJ9 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: -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 Telephone Headset