"Guard yourself, Batman! My time numerals will shock you senseless if they touch you!"
Chronos, "Crisis on Earth-One!"
Okay, circumstances pit you against Batman. Batman, the one-man thwarting machine for whom the word "outwit" was invented. Batman, who once made a telegraph out of some loose change and a glass of saltwater. Batman, who mastered every known science and discipline, honed his body to peak physical perfection, and became an unparalled martial artist and the world's greatest detective in precisely TWO panels.
You, fortunately, have one of those surreal silver age devices that can fry his great brain, gelatinize his olympic-level musculature, and leave him a twitching lab frog to be prodded for your amusement.
Any simple crook would just use the device. But it takes a villain to warn Batman before doing so. That's fairness!