The mechanical button doesn't provide feedback unless the watch is charged. 

If the watch is charged, every time you press the button, you feel a little vibration (haptic feedback).

It was extremely difficult to find the right balance in between having a button too soft (and therefore your child might press it inadvertently), and too hard (for obvious reasons). However the button will soften a bit after few days of use, making it perfect to use even for a 3 years old.

If the button of your watch seems to be not functioning, please try to:

- Plug the watch to its charging cable, plug the charging cable to a power source

- Press the button

Do you feel a vibration? 

If the answer is yes, your button works.

If the answer is no, please open a ticket here: https://joyfamilytech.freshdesk.com/en/support/tickets/new