Despite rubbing shoulders with godlike superhumans, the 100% mortal Batman is somehow able to hold his own when it comes to saving the world. Part of that is down to Bruce Wayne's unparalleled honing of his body and mind, but his famous gadgets and vehicles also play a huge part. In fact, one forgotten gadget actually explains Batman's seemingly unbeatable ability to get the drop on his opponents, even when they have him at a disadvantage.
Batman's armor and gadgets walk a fine line between the type of futuristic technology a billionaire vigilante would need to keep up with literal demigods and the mystique of remaining relatably human while doing the impossible. Sometimes — especially when Superman is in need of a beatdown — Batman will temporarily don advanced armor, but generally DC has opted to keep Bruce Wayne distinct from Tony Stark's Iron Man and his reliance on bleeding-edge tech. Despite this, one of the most iconic eras of the Justice League equipped the Caped Crusader with a simple gadget that gave him an incredibly effective advantage.
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Throughout JLA vol. 1 — a series which saw luminaries such as Grant Morrison, Joe Kelly, Mark Waid, Bryan Hitch, and Doug Mahnke depict DC's greatest heroes — Batman is depicted as utilizing a proximity alert to inform him whenever anyone gets close enough to attack. Similar to Spider-Man's Spider-Sense, this gives Batman a head start on impending threats, often with the benefit that they believe they're going undetected. While it's not on the same level as the powers of the rest of the League, it's the perfect gadget for Batman, who thrives on being one step ahead of his opponents, and loves to turn the
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