Smoke detectors. 

Days after the inspection, the buyer and his agent came by the house (based on notification from the keybox), and did their own walk through and responded back saying that the smoke detectors were not working and the electrical panel needs major work. 

They also require a roof, chimney and furnace inspection which my inspector told me all were in great condition.Other things needed are fire extinguisher and an additional smoke and co detector.

It's also acceptable to hold tenants accountable for consumables like light bulbs, smoke detector batteries, or filters in the refrigerator.

Additionally, each unit has to have the new 10 yr smoke detectors per state law.

I would at a minimum install smoke/CO2 detectors and provide fire extinguishers as appropriate. 

"Smoke detectors and handrails" is what my original realtor said to me when we bought our house. 

Motion detectors? 

The old business that was in there before has CO/fire detector.

Here we are required to use the 10-year sealed detectors.