Using your Longines HydroConquest watch is a breeze. To set the time and date, gently pull out the crown to the appropriate position and turn it. When you're done, push the crown back in. For daily use, this watch is suitable for most activities, but avoid exposing it to extreme temperatures or strong magnetic fields. 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 keeps accurate time and functions properly.