Abstract: A device (1) for measuring and/or monitoring physiological signals of a user configured to be attached to a first (12) and a second (13) wearable holder, wherein each of the first (12) and second (13) wearable holders is configured to be attached to a different part of a user's body, and the first wearable holder (12) comprises a first holding frame (14, 41) configured to removably be attached to the device (1) and to wrist fastening means.