Using this watch is easy. Just press the button next to the watch face to turn on the LED light when you need extra illumination. As for care, since it's water - resistant, you can wear it in light rain or when washing hands, but don't submerge it for long periods. To keep it looking good, wipe it with a soft, dry cloth regularly. If you notice any issues with the LED light or timekeeping, it's best to contact customer service.