We know it's tempting - whenever you see a button, you simply want to press it ;)
However, there is no need to do so when taking your daily test. Your inne reader will wake up from sleeping mode automatically once you insert an activated strip (given it's sufficiently charged).
In fact, that's the reason for placing it at the bottom of your reader in the first place!
So what does the button actually do?
Well, it comes in handy when you want to check whether you have any unsynchronised results stored on your reader. You also need it to start set up mode for updating the reader's firmware, pairing it to a (new) phone or establishing an additional Wi-Fi connection.