Features: Quality optimization of exclusive patent, metal composite vibrating membrane. 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 friend Specification: Brand Qkz Model Ck1 Material Pc Weight 20g Speaker 9 mm NdFeB speaker Speaker Power Rated input power: 3mW, Maximum input power: 5mW Impedance 16Ω±15% Speaker Sensitivity 97±3dB (at 1KHz 1mW) Speaker Frequency Response 20-40K Hz Microphone Sensitivity -42dB±3dB1kHz, 3V 0dB=1V/pa Operation Temperature -10 Celsius — 40 Celsius Function Play / Pause, Answer / Off, Noise Cancelling, Microphone