Feature: 1. NOISE CANCELING HEADPHONES: Built in high definition microphone, can be arbitrarily twisted, so that your voice is loud and clear. Provide clear dialogue even in noisy environments. The noise is smaller and the sound is clearer. 2. ALL DAY COMFORT: The headset provides you with an ultra light and long lasting wearing experience. The soft ear cushions and flexible headband will not cause any burden to your ears. Super lightweight design. 3. ULTRA DURABLE: The earphones are designed with sturdy structure and materials to ensure superior performance and make them durable. The long headphone cord provides flexibility of movement. 4. EASY TO USE: This single ear customer service headset fits RJ9 plugs; plug and play, no driver required, and easy to use. Support speaker volume adjustment. 5. WIDE COMPATIBILITY: Suitable for devices with RJ9 headphone jack. Ideal for home offices, call centers, telemarketing, insurance, customer service, conference calls, etc. Specification: Item Type: Telephone Headset Model: H360-RJ9-VA Material: ABS Colour: Black Type: Single Ear Function: Call/Speaker Volume Adjustment 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 178mV 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 Current Consumption: 100-500υA. Package List: 1 x Telephone Headset