Adhesive patches applied directly to the skin that deliver a 30,000-volt contact discharge when touched by another person's bare skin. The DS-4 uses the body's natural bioelectric field as a circuit component — the wearer's skin provides the ground path, and the patch's outer surface is the active electrode. When another person's skin contacts the patch, their body completes the circuit, receiving the full discharge. The patches are flesh-toned and nearly invisible when applied, designed to be placed on commonly grabbed areas: forearms, upper arms, shoulders, and the back of the neck.

Axiom developed the DS-4 as the most discreet anti-grab defense available. Unlike electrified clothing or visible deterrents, the patches are undetectable until triggered. Each patch contains a micro-capacitor that provides a single discharge, after which the patch is spent. They adhere for up to twelve hours before the medical-grade adhesive degrades, and they are waterproof and sweat-resistant.

The DS-4 is sold in sheets of ten patches for Φ35. Their disposable nature and low cost have made them popular across all tiers, from Tier 1 residents who apply them before walking through dangerous areas to Tier 4 professionals who wear them to business meetings where unwanted physical contact is a concern. Axiom's marketing is deliberately vague about use cases, allowing customers to project their own needs onto the product.