What exactly is the difference between this product and the one with item number 13178673? That you get one more brush head and pay a total of CHF 190 for it? https://www.galaxus.ch/de/s6/product/philips-sonicare-diamondclean-9000-elektrische-zahnbuerste-13178673.
Actually, both devices should support the Sonicare app, as they belong to the Diamond Clean 9000 line, correct?

Question

What exactly is the difference between this product and the one with item number 13178673? That you get one more brush head and pay a total of CHF 190 for it? https://www.galaxus.ch/de/s6/product/philips-sonicare-diamondclean-9000-elektrische-zahnbuerste-13178673. 
Actually, both devices should support the Sonicare app, as they belong to the Diamond Clean 9000 line, correct?

Answer

The cheaper model has no app support. 
Without guarantee, if in doubt, ask the manufacturer.

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Question about Philips Sonicare DiamondClean 9000