Feature:1. Compact and Portable: Being so small and lightweight, this product does not take up much space and can be easily taken away.2. Durable material: This product is made of high-quality material, durable, long time use, sturdy and stable to use.3. Related personnel: police, soldiers, security guards, amateur businessmen and team members. Description:Suitable for police, military, nightclubs, bars, paintball, security, hotels, restaurants, security guards, warehouses and noisy environments. Specifications:Frequency response range: 20-20000HzSensitivity: 90 ± 3dBComcommunication: wired: Rolling resistance: e, adhesion on 8Omega; Connector: About 3.5mmPackage Included:1 * g-hook earphoneNotes:1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.