Provided herein are biosignal measurement means and a biosignal monitoring system using, for example, an earphone. For example in one embodiment, an earphone is provided that includes a first sensor disposed around an output of a left earphone, a second sensor disposed around an output of a right earphone, and a transmitter configured to transmit bio-signals acquired from the first sensor and the second sensor to a digital device. The first sensor can include a first bio-signal electrode, and the second sensor can include a second bio-signal electrode.
