The sleek bluetooth headset features two discreet rocker buttons for volume adjustment and music controls. That way you have quick access to these functions without unlocking your phone.The soft, silicone earbuds come in 3 different sizes for a tight seal and comfortable fit.To optimize sound quality for calls and music, we kept the speaker output structure at a narrow 3mm,so that detail in the mid and high frequencies are preserved and noise is significantly reduced.