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Stun guns are designed to work on contact. This means they must touch something to fully engage.
Due to the concealed prong design on some of our stun guns, it is common that only one prong will appear to light up when testing the tool. This is not a defect.
Using caution, you can further test your stun gun. We recommend doing this outside, in an open space. Take a sheet of paper and carefully place it on top of the probes. When turning the stun gun on, you should see both sparks light up.
If you are still experiencing any difficulties, please file a warranty claim and our Customer Care team will be happy to assist further.