The Guardian PSR-1 is a micro stun rod approximately the size and weight of a thick marker pen — 14 centimeters long, 1.8 centimeters in diameter, weighing 45 grams. One end is a pocket clip and recessed charge indicator; the other is a blunt contact tip with a single annular electrode. Inside is a single-use compressed capacitor assembly that stores enough energy for three full discharges at 35,000 volts before the capacitor is depleted, at which point the unit is discarded. There is no recharge port — the PSR-1 is a disposable product, sold in two-packs and four-packs at Tier 2 convenience outlets, pharmacies, and transit hub vending machines.

Guardian designed the PSR-1 around the concept of last-resort personal defense — a device so small and so simple that it offers a meaningful option to people who would carry nothing else. The activation mechanism is a deliberate squeeze-and-twist: the user grips the device firmly and rotates the upper third 90 degrees, which both arms the discharge and moves the contact tip to the active position. This prevents pocket activation while remaining operable under stress with one hand. The three-discharge limit is not a compromise — Guardian's research indicated that most defensive incidents requiring a shock weapon require one to two discharges, and a three-discharge limit keeps the capacitor assembly small enough for the form factor.

The PSR-1 is the most widely sold shock device in GLMZ by unit volume. Its Φ28 two-pack price point makes it accessible to Tier 1 residents in a way that no licensed security product is. Guardian's marketing for the PSR-1 is deliberately quiet — no dramatic imagery, no explicit weapon framing, just the phrase 'small enough to forget you have it, until you need it.'