1.Description:multifunctional ecg electrodes;2.Perfit for 3.0mm Din plug or 0.156mm-in (4.0mm)banana plug or (4.0mm)snap leadwires.3.Latex-free,Website:http://www.upnmed.org, Adult size replacement bulb for all 15mm, diameter electordes,Bulb volume is 5cc4.Compatibility:all Resting ECG Recommended for GE-Marqutte,Schiller, Bionet,Mortala,Burdick....