Does the watch have an alarm?

Yes. I have this watch and you can set the alarm. It’s an awesome watch.

Es recomendado para niños de 8 años o mejor el mini?

It will fit on wrist sizes between 5 and 8 inches

Where do I find Manuel instruction

In order to reduce our carbon footprint and be a more environmentally conscious company, we stopped printing paper instruction manuals many years ago. As noted on the sticker that came in the box with your watch as well as on the box itself, you can find, read or download a copy of the instruction manual for your watch from our website at https://www.freestyleusa.com/manuals. Just go to that page and you will see a drop down box with the manuals for all of our watches as well as care instructions, videos on our YouTube channel and other helpful information about caring for your watch.