The TAG Heuer Monaco Split-Seconds Chronograph "Air" CBW218B.FT8124 launched in 2025, is one of four models in the Monaco Split-Seconds series. It boasts a 41 mm square case made of grade-5 titanium, offering a blend of polished and brushed finishes. Staying true to the Monaco design, the crown is situated on the left while the chronograph pushers are on the right side of the case. A sapphire crystal, enhanced with anti-reflective treatment, protects the watch face, complemented by a screw-secured sapphire case back. This timepiece features a split-seconds (rattrapante) mechanism, showcasing the complexity from both the dial and motion side.

Powered by the TH81-00 caliber, which was developed in partnership with Vaucher, this automatic movement runs at 28,800 vibrations per hour and provides around 65 hours of power reserve. Notably, most of the split-seconds mechanism is visible on the dial side, including the rattrapante clamp, split-seconds column wheel, and the chronograph brake components. The oscillating weight, partially skeletonized, is situated at the back of the movement, ensuring the unique features of the split-seconds mechanism are visible. The dial is fully openworked, revealing the intricate chronograph structure, while the "Air" version stands out with its blue-tinted components and finishes. Central hour and minute hands indicate the time, while two chronograph hands track seconds and split-seconds. A 30-minute chronograph counter is positioned at the 3 o'clock mark and running seconds are displayed at 6 o'clock. The tachymeter and chronograph scales are printed on a transparent upper layer integrated into the dial. Completing the look is a rubber strap with a fabric-like outer texture, and a titanium folding clasp, designed to follow the geometric lines of the square case.