20pcs one small box , inside has black 10pcs and white 10pcs
3.5mm Headset call Support Mic Voice Prompt
-Bass extremely strong, great sound
-The wire is made of high quality PVC material. Completely new and powerful design suitable for today's young fashion
- Pin 3.5 design connects to most phones, music players, tablets, ...
Audio frequency range from 20Hz - 20kHz