Figure 1. ECG monitoring system (Duranta) and the delivery method. (A) The Duranta and the iPhone for transmitting ECG data. (B) The Duranta is easy to attach to the chest via two electrode patches. The real-time ECG data can be seen on the iPhone. (C) The doctors and medical staff can see the ECG on an iPad and analyze the data on a computer at the hospital. (D) Delivery method of the ECG devices. A Duranta, an iPhone, a battery charger, and electrode patches are surrounded by cushioning materials were packed in a small paper box (225 mm wide × 160 mm deep × 22 mm thick). The paper box was put in a pre-paid envelope (Letter Pack Light, Japan Post) and mailed. When the ECG devices were sent from the hospital to patients’ homes, a return envelope was also included. The Letter Pack can be put in any postbox. ECG, electrocardiogram.