} A 3.5mm mono jack plug with 1.5M of cable terminated in a single 2mm stackable plug and a single 4mm plug. The BiCable is useful whenever there is a mismatch between an electrode with a 2mm/TENS socket, such as a sticky pad, and an electrode with a 4mm socket, for example a Urethral Sound or our E-Stim ElectroWands to any of our E-Stim control boxes.