Feature: 1. ERGONOMIC DESIGN: Phone headset provides you with ultra light wearing experience. Soft ear pads and flexible headbands. 2. NOISE CANCELING MIC: Built in HD microphone provides clear dialogue even in noisy environments, and can be twisted at will. 3. EASY OPERATION: Easy to use, RJ9 plug, plug and play, no driver. Wide compatibility, suitable for devices with RJ9 headphone jack. 4. WEAR RESISTANCE: The rugged construction and material design ensures superior performance and makes it durable. The long headphone cable provides mobility. 5. APPLICATION: Suitable for home, offices, call centers, telemarketing, insurance, customer service, teleconferencing, and more How to Use: Plug and play Specification: Item Type: Telephone Headset Material: ABS Model: H360-RJ9-MV Color: Black Type: Monaural Plug: RJ9 Crystal Head Function: Call/Speaker Volume Adjustment/Microphone Mute Scope of Application: For Devices with RJ9 Headphone Jack Speaker Parameters: Sensitivity: 105±3dB (at 178mV 1KHz) Voice Coil Impedance: 150±15Ω (at 1KHZ) Frequency Characteristics: 100Hz-10KHz Distortion: ≤5% (at 178 mV 1KHZ) Microphone Parameters: Directivity: Single Point Sensitivity: -40±2dB（2.0V, 2.2KΩ, 1KHz） Distortion: ≤5% (at 4.5V 2.2KΩ 1KHZ) Frequency Characteristics: 200Hz-6KHz Consumption Current: 100-500υA Package List: 1 x Telephone Headset