One embodiment of the invention is a cardiac monitor having a housing a plurality of electrodes within and extending from the housing a state machine within the housing configured to digitialize and store in memory signals from the plurality of electrodes a sealing surface and an adhesive on the sealing surface configured to form a watertight perimeter around the plurality of electrodes when the housing is affixed to a mammal. Another embodiment of the invention provides a continuous cardiac monitor having a housing a surface on the housing adapted to be sealably engaged to a mammal an adhesive on the surface that is adapted to remain affixed to the mammal for at least 7 days at least two electrodes within the housing positioned to detect a cardiac information of the mammal while the surface is sealably engaged to the mammal an electronic memory within the housing wherein, the electronic memory is sized to store at least 24 hours of continuous cardiac information and wiring within the housing connecting the electronic memory to the electrodes.
