Most stun gun shopping starts with the wrong question. Buyers compare voltage — 20 million, 50 million, 100+ million — assuming the bigger number means more stopping power. It doesn't, and understanding why changes how you should actually shop for one.
The Truth About Stun Gun Voltage
Back in the early 2000s, stun guns were marketed at 300,000 volts. As competition between manufacturers heated up, the advertised numbers climbed into the millions, and now well past 100 million on some brands. A stun gun only needs about 25,000 volts to arc across a small gap and penetrate clothing — everything past that point is marketing, not additional stopping power. Voltage's real job is punching through fabric to reach skin. Once it's done that, the number stops mattering.
Why Amperage Is the Real Measure
The human body responds to amperage, not voltage. That's why stun guns are deliberately capped at a low milliamp (mA) range for safety — even a fraction of an amp can be dangerous at sustained exposure, so every legitimate consumer stun gun stays well under that threshold.
| Output | Effect on the Body |
|---|---|
| 1 mA | Tingling, mild discomfort |
| 3-4.9 mA | Pain, muscle contractions, temporary incapacitation |
| 5+ mA | Risk of device failure or circuit burnout in consumer units |
Most higher-output civilian stun guns sit in the 3 to 4.9 mA range — enough to cause real muscle disruption and pain compliance without permanent harm. Voltage gets you through the clothing; amperage is what actually stops the attacker once contact is made.
How a Stun Gun Actually Works
A stun gun runs on a rechargeable or replaceable battery, a transformer and circuitry that convert that low-voltage battery power into high-voltage pulses, metal contact probes that deliver the charge, and a capacitor that stores and releases the energy in rapid bursts. When activated against a target, the pulses overload the nervous system's ability to coordinate muscle movement, producing pain, spasms, and temporary disorientation — enough of a window to disengage and get away. The most effective contact points are large muscle groups: chest, abdomen, thighs, or the neck and shoulders.
Legal Limits on Stun Gun Output
There's no single federal amperage cap, but the practical ceiling manufacturers build to is around 5 mA — beyond that, consumer-grade circuitry risks failure, and the added output isn't necessary for civilian self-defense use. For comparison, police-issue TASER devices — a different category of tool that fires probes rather than requiring direct contact — typically deliver an average current in the 1.2 to 3.6 mA range, relying more on pulse frequency and sustained contact than raw amperage. See our full stun gun vs. TASER comparison for how the two technologies actually differ. As always, check your state's specific stun gun laws before purchasing — restrictions on amperage aren't common, but restrictions on stun guns generally vary significantly by state.
High-Amperage Stun Guns Worth Considering
If maximum civilian-legal amperage is the priority, these three models sit at or near the top of what's available:
Runt Stun Gun — 4.5 mA
Compact, rechargeable, available in four colors, with a built-in 100-lumen flashlight and a wrist-strap disable pin. View the Runt Stun Gun.
Grab Guard — 120,000,000 Volt Stun Gun
Adds anti-grab stun strips along both sides of the body — if someone tries to pull it from your hand during a struggle, they get shocked before they can take it. Also includes a 130 dB alarm and LED flashlight. View the Grab Guard.
The Master Blaster — 4.9 mA
One of the higher milliamp outputs available, with a three-level safety system including a disable pin that renders the unit inert if it's pulled from your hand. View The Master Blaster.
Frequently Asked Questions
What is the highest legal amperage for a stun gun?
Most civilian stun guns cap out around 4.9 mA. That's the practical ceiling manufacturers build to for reliable, safe consumer operation — not a specific legal number in most jurisdictions.
How many volts does a typical stun gun have?
Advertised voltage ranges from the low thousands up to well over 100 million on some brands, but only about 25,000 volts is actually needed to penetrate clothing. Past that point, higher voltage claims don't translate to more stopping power.
Are high-voltage stun guns better than lower-voltage ones?
Not necessarily. Once a stun gun has enough voltage to get through clothing — which most models do — amperage is what determines how effectively it disrupts muscle control on contact. A lower-voltage, higher-amperage model can outperform a higher-voltage, lower-amperage one.
Will a stun gun work on someone under the influence of drugs or alcohol?
Yes, though it may take longer contact time to achieve full effect. Substances that reduce pain response can also reduce how quickly a stun gun's effects set in.
Shop High-Amperage Stun Guns
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