Using your Longines HydroConquest watch is easy. Just set the time and date according to your local time. To adjust the time, pull out the crown gently and turn it clockwise or counter - clockwise. For the date, turn the crown in the appropriate direction when it's in the correct position.
Here are some important notes. Avoid exposing the watch to extreme temperatures or strong magnetic fields as these can affect its performance. Also, don't operate the crown underwater as it may cause water to enter the watch.
When it comes to maintenance, keep the watch clean by wiping it with a soft, dry cloth regularly. If it gets wet, dry it thoroughly. Have the watch serviced by a professional every few years to ensure it runs smoothly.