Features:Metal composite vibrating membrance.The ergonomic design, nipple grade silicone ear muffs.Ear and tail pipe connection with oblique angle design, comfortable and easy to wear.It has high quality sound, enjoy your life.A perfect gift for yourself or friendSpecifications:Type: Piston In-Ear EarphoneWeight: 12gSpeaker: 8 mm NdFeB speaker Mini Dual DriverSpeaker Power: Rated input power: 3mW, Maximum input power: 5mWImpedance:32Ω±15%Speaker Sensitivity: 106±3dB (at 1KHz 1mW)Speaker Frequency Response: 20-20K HzMicrophone Sensitivity: -42dB±3dB1kHz, 3V 0dB=1V/paOperation Temperature: -10 Celsius --- +40 CelsiusFunction: Play / Pause, Answer / Off, Noise Cancelling, MicrophoneCable length: 1.2mPackage Included:1 x headphoneNo Retail Box. Packed Safely in Bubble Bag.