Designed with a nicely contoured, rounded shape, the ear buds fit gently and safely in the ears, offering secure placement and long-lasting comfort. Make Calls Hands-Free Equipped with a built-in microphone, the in-ear headphones can be used for hands-free phone calls -One click: start/stop music or answer/end calls -Two clicks: skip to next song Five Color Options with Color-matched Cords Express your individuality while enjoying your favorite music. With 5 color variations included, you'll always find one that best matches the day's outfit, your audio player and your mood. Comfort-Length, 1.2m Cord for Extra Convenience A comfort-length, 1.2m color-matched cord provides the flexibility and comfort needed for an active day, and can be comfortably threaded through a jacket, bag, or backpack. 1. Impedance: 16Ω 2. Sensitivity: 91±3dB 3. Speaker size: 10mm 4. Cable length: 120cm 5. Frequency range: 20-10000HZ 6.Plug Pin:3.5 mm 7. Transducer Principle: Dynamic 8. MIC: High-Quality Sensitive In-line Microphone 9. Volume Control: Yes 10. Product Certification: CE, FC, ROHS Certification