Yozoro Standard Earphone O19 Features: - Designed according to human body engineering - Simple and comfortable to wear - Simple, compact and easy to carry - The product meets the latest environmental protection standard, all raw materials, non-toxic, no halogen, safe to use. Specifications: - Model: O19 - Nominal Frequency: 32±15% ohms, f =1KHz - Effective Frequency Band:20Hz-20KHz - Rated Power Input: 3mW - Max Power Output: 5mW What's in the box 1x Standard earphones