HUMUNGOUS PLAYTIME] : Achieve enormous playtime of 33 hours with the Harmonics Z5 wireless earphones. With its humungous long-lasting battery of 250mAh, use it anytime and anywhere and enjoy the music non-stop. [DUAL EQ MODES] : No matter what sound type you seek, Harmonics Z5 allows you to achieve the desired sound output with its Dual EQ modes - Base mode and Music mode. Switch to your desired EQ mode with just a click.