3"x3" Electrode

Because of the design, the 3x3 version of this product only has a 2x2 conductive surface: the yellow housing is 3x3 but the opening for the conductive surface is only 2x2.Also, the yellow housing doesn't have space to accommodate the banana plug jack which causes a bulge that deforms the yellow housing and sponge, so the electrode requires more pressure to sit flat on the skin. If the yellow housing had extra space on the back to accommodate the bulge from the banana plug jack, this would be resolved.