YK Care&reg; DC 3.5mm Electrode Wires Tens EMS Machine 2-pin Cables Standard Connection 3.5mm Reusable 2mm Plug in Long-life Massage Machine (DC3.5 mm 2-pin, 5pcs) Tens/EMS Machines electrode lead wires 2mm Plug Fit for most portable electrotherapy units The lead wire is used to connect the current from the TENS device to your electrodes The connection to the Tens unit measures 3.5mm and the pin connections to the Tens pads are a standard 2.0mm connection ontents: 5 pcs electrode cables