Using this Seiko Prospex watch is a breeze. Just wind it manually if you want to top up the power reserve, which can last for about 72 hours. The stop second - hand function is handy when you need to set the time accurately. When you're out in the water, it can handle depths of up to 300m. As for care, keep it away from strong magnetic fields as they can affect the movement. Clean the case and strap regularly with a soft, dry cloth. If you notice any issues or after a long time of use, it's a good idea to take it to a professional watchmaker for servicing.