What should I understand by the size specification 40mm? (Fitbit Versa Lite says 34mm, which is the screen diagonal. Which also corresponds to a screen width of 24.075mm. The Versa 2 says the screen width is 25.07mm.... but that doesn't give me 40mm. Or am I calculating something wrong?) Actually, it would still be important for me to know the outer dimensions of the housing. So that I can get an idea of the size of the case.