The HP 840955-001 microphone module is a service part identified in HP’s ZBook Studio G3 maintenance guide. It is intended for installation in the display enclosure, where it serves as the microphone module for the computer.
The guide describes the module as attached to the enclosure with double-sided adhesive. During removal, its cable is disconnected from the module. These details help identify the part and its placement when servicing the display assembly; the guide does not specify further electrical or acoustic characteristics.