English to Chinese Social Sciences Sports / Fitness / Recreation

Part of the 2000 series of professional sports watches, Tag Heuer's Aquaracer 2000 was designed in close collaboration with Tanya Streeter, the women's free-diving world-record holder, who once plunged 122 meters on a single breath (for some reason...). The elegant, slim-cased 41 mm automatic offers water resistance down to 300 meters, date feature, rotating aluminium bezel, an extendable bracelet and an extra dab of luminescence on the second hand so you'll be able to tell the darn thing is working in the darkest ocean or dreariest boardroom. Made of stainless steel.
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如果我没理解错的话，the darn thing应当就是指 Aquaracer 2000这款手表。但这个短语从字面上该如何理解呢？