Siemens Cerberus DB-4 Detector Base

Overall, the Siemens Cerberus DB-4 is a detector base.

Installation 

1. Remove detector from the base, if the detector is in the base.
2. Position spring 1 * in model db-3s slot as shown.
3. Position plastic tab 2 * in the same slot over the spring
4. Press the plastic tab firmly inward and let it go. (the tab will automatically lock in place)
5. Reinstall detector to base. (position of detector cover will be as shown in section a-a dotted line)