Arrhythmia Research Technology, Inc. (ART), through its wholly owned subsidiaries has three operating business segments. Its wholly owned Massachusetts subsidiary, Micron Products, Inc. (Micron) and its division Micron Integrated Technologies (MIT) comprise the Company's Medical Electrode Components and Plastic Molding segment. ART's wholly owned Delaware subsidiary, RMDDxUSA Corp. (RMDDxUSA), and its Prince Edward Island, Canada, subsidiary, RMDDx Corporation (RMDDx and collectively with RMDDxUSA, referred as WirelessDx) comprise the Company's developing Medical Monitoring Services segment. Through its Computerized Medical Instruments segment, ART is engaged in licensing signal-averaging electrocardiographic (SAECG) software, the PREDICTOR series. A fourth segment, Corporate, tracks expenses of the public holding company.