Features The simulator attaches to these devices through a standard ZOLL Multi-Function Cable and a 3-Lead ECG Patient Cable Three ECG snap-on buttons on the right side of the simulator are for attachment of ZOLL ECG patient cables, and will display LEAD I, II, and III signals These will show the RA, LA, and LL ECG signals normally seen by the ECG monitor through a 3-lead patient cable ECG rhythm displays to the pacing/defibrillator unit via the Multi-Function Cable