A swimming heart rate monitor comprises a strap, a first electrode, a second electrode, a first electrical connector, an electronics module, a second electrical connector, and a water sealing feature. The strap covers a portion of a user's chest. The first and second electrodes are positioned on an inner surface of the strap to contact the user's skin. The electrodes provide an electronic heart signal corresponding to the heartbeat of the user. The first electrical connector is positioned on an outer surface of the strap and is in electronic communication with the first and second electrodes. The electronics module may attach to the strap and process the heart signal. The second electrical connector is accessed on the electronics module and may electrically connect to the first electrical connector. The water sealing feature prevents water from interfering with the connection of the first electrical connector and the second electrical connector.
