The Jaeger-LeCoultre Polaris Chronograph Q9028180 features a 42mm round stainless steel case with polished and brushed finish. Powered by the in-house Calibre 751H automatic chronograph movement with vertical clutch, column wheel, and twin mainspring barrels providing 65-hour power reserve. The movement beats at 4Hz (28,800 vph) with 37 jewels and 262 components, finished with a unidirectional tungsten rotor with ceramic bearings. Blue sunburst, grained, and opaline dial with white luminescent Arabic numerals and indices. Chronograph with central seconds, 30-minute counter at 3 o'clock, 12-hour counter at 9 o'clock, and tachymeter scale. Scratch-resistant sapphire crystal and transparent sapphire caseback. Stainless steel bracelet with quick-change system and folding clasp.