I just bought the watch and accidently noticed there are 2 tiny holes on the side next to the start button. I'm just curious and because I plan to buy a silicon case for it to protect it, I dont want to cover it if that is a kind of sensor which can't covered. It must be a reason being there. I have a fr45s too, which is 5 buttons as well but it hasn't got those holes. Do anybody knows their function? Maybe for the wify? Thanks