https://nl.ifixit.com/Answers/View/756243/Can+I+pair+the+camera+to+my+phone+galaxy+9+
Can I pair the camera to my phone galaxy 9+ - Motorola MBP33SBU - iFixit
Galaxy 9+ can I pair camera to it - Motorola MBP33SBU
https://nl.ifixit.com/Guide/Motorola+MBP33SBU+Baby+Unit+Speaker+Replacement/99623?lang=en
Motorola MBP33SBU Baby Unit Speaker Replacement - iFixit reparatiehandleiding
The Baby Unit Speaker allows sound between the two units. You will need a soldering kit to successfully install a new speaker.
baby unitspeaker replacementmotorolaifixit