options of spectra s2 to consider

Hi i am ordering spectra s2 through my insurance.
Do u ladies have any opinions on ehat should i be considering while ordering it
.
1. I read it comes in a battery option also
2. Some flanges 
(Which size of flange will work for normal size nipples ,n i wear 36C nursing bra)
.
3. Does it comes with double pumps?
.
 Any other suggestions?

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