Packaging:
The alarm arrived in clear clam-shell packaging (yuck). In the shell was the alarm, 2 AA alkaline batteries, mounting screws, and instructions. I am a guy so who needs instructions. I am very satisfied with the packaging.

Installation:
Installation was a breeze. The two batteries were installed so I just had to push in the battery tray. The new alarm was replacing an old First Alert fire alarms that we have had for over 20 years. I now know you should replace alarms every 10 years. I removed the old alarm by loosening the mounting screws a couple turns, turning the old alarm to align the mounting holes and that was that. The new alarm has a base and alarm. The new base fit perfectly over the existing screws from the old alarm. Tighten the screws and the hard part is done. Then place the alarm over the mounting plate and give a 1/3 turn and you are done.