Instead of wireless radios, the Longines Conquest VHP GMT Flash Setting Watch uses an old-school approach to interact with your phone. Select the times for your home and your destination in the app, and it converts the info to morse code, using your phone's flash to transmit the info to the watch via a small aperture in the dial's 12 o'clock marker. You can swap between the times with two clicks of the crown, which can also be used to set the watch traditionally. Its movement is accurate to +/- 5 seconds per year, will automatically reset the hands after an impact, and has a perpetual calendar good through 2399. It's available in both 41 and 43mm case sizes, in stainless or PVD black finishes, and is finished with either a rubber strap or stainless bracelet.