UltraStim Snap patented current controlling neurostimulation electrodes distribute current evenly and comfortably through the use of a snap connector rather than a lead wire. The bottom snap is scientifically chosen to match impedance in the entire system to provide even current distribution across the surface, even with a snap. The proprietary silver grid pattern is specially calculated to precisely control electrical current over the electrode surface, while the border around the grid pattern allows for an intentional current roll-off to eliminate edge stinging. Utilizing Axelgaard’s patented multi-layer MultiStick hydrogel eliminates performance problems associated with electrodes featuring single-layer gels. These electrodes are reusable and self-adhering. 3 models offered: ERP3735-2020: 2 x 2" (5 x 5 cm) Square (4) ERP3735-2040: 2 x 4" (5 x 10 cm) Rectangle, single snap (4) ERP3735-2042: 2 x 4" (5 x 10 cm) Rectangle, double snap (2) Follow this link for the Axelgaard Education Videos presented by Dr. Lucinda Baker.