Medical device technologies play a crucial role in the diagnosis, treatment and follow up of patients with arrhythmias. In line with the Journal's commitment to advancing scientific understanding and patient care, JACC: Clinical Electrophysiology will publish a special focus issue highlighting research on this topic. Manuscripts spanning this theme will be considered, including those examining technologies that report advances in the diagnosis, treatment, and monitoring of short- and long-term outcomes. Emerging areas such as artificial intelligence and machine learning applications are also of interest. Submissions are due by Nov. 1. See submission instructions on JACC.org.