Longines Pioneer has launched a chronograph wristwatch featuring a flyback function. 1. The watch has a diameter of 42mm and a bi-directional rotating bezel, available in matte black and blue, with Arabic numerals that glow in the dark set against black small holes, in sync with the official website. 2. The dial comes in black and blue, with the chronograph subdial at the 3 o'clock position and a small seconds subdial at the 9 o'clock position, while the central large seconds hand serves as the main chronograph hand. The 6 o'clock position on the dial is marked with the Flyback function, making this chronograph very convenient to use. 3. The sapphire crystal has a slightly domed shape and features anti-reflective coating on both the inner and outer surfaces. The bi-directional rotating bezel operates with precision and smoothness. This watch is equipped with a screw-down crown that is easy to grip and adjust, while the sealed case back is secured with six screws, providing excellent water resistance up to 100 meters. 4. The watch comes with a stainless steel bracelet, a brown calfskin strap, and a NATO blue fabric strap, offering different versions with the original folding clasp to suit various style preferences. 5. It is powered by a modified L791 automatic movement based on the 7750 caliber, capable of providing a power reserve of up to 68 hours, and is certified by the Swiss Official Chronometer Testing Institute COSC .