If I?m installing multiple detectors at the same time, how do I know which detector I am installing?

Each detector must be enrolled through the app individually. The easiest way to enroll detectors is to enroll one at a time by inserting batteries only into the device you are ready to enroll. In the case where you have already inserted batteries for multiple detectors prior to enrollment, you will see multiple MAC IDs in the app to choose from - in that case you would need to identify which device you are enrolling by looking up the MAC ID.