Product Features :
The tuning system with multiple sound outlet holes, ensures high-fidelity experience and high sound quality when you make phone calls and listen to music.
Combining the features of in-ear earphones and traditional earphones, and designed.
To control the volume: Push the button towards "+" sign to turn up; push the button towards "-" sign to turn down.
Answer key: When there is an incoming call, press the button to answer; press again to hang up.