Certain examples of the present invention relate to a multi-electrode device for use with a user's body part. Certain examples provide an apparatus (100) comprising: a plurality of electrodes (101)； a signal line (102) for conveying electrical signals to or from the plurality of electrodes (101)； wherein the plurality of electrodes (101) and the signal line (102) are integrally formed in the apparatus (100), and wherein the apparatus (100) is configured such that a user is able to selectively electrically couple one or more of the plurality of electrodes (101) to the signal line (102).
