There is provided an electronic device for long-term adhesion to a mammal, the device comprising: a flexible first wing and a flexible second wing extending laterally from a housing without overlapping, wherein each wing includes a hinge portion adjacent the housing； a first electrode positioned on the bottom surface of the first wing and a second electrode positioned on the bottom surface of the second wing, the electrodes electronically connected to a rigid physiologic data collection circuit； an adhesive layer on the bottom surface of each wing, the adhesive layer providing adhesion to the surface of the mammal； and a floating section forming a water-tight enclosure and comprising the rigid physiologic data collection circuit, the floating section configured to float above the surface of the mammal in response to movement of the mammal； wherein the rigid physiologic data collection unit extends along only a portion of the distance between the electrodes.
