-It comes with 6 AA batteries.

-The access to the batteries is so much easier. You don't need to remove the panel, it's as simple 
as toggling a lock button to open the panel and change the batteries as needed.

-The feature to silence a alarm from your phone is a great feature.

-It really does give you peace of mind knowing that you will be informed if there are any emergencies at 
your home.

- Quality is top notch and easy to install as changing a light bulb.

- The alarm will warn you by telling you what location the smoke is coming from before the loud alarm 
actually goes off.

-It has Path light, a motion activated LED white light.

-The system works even without active wifi. 

- Everything in the manual is accompanied by very good pictures to help you along the way.

- The app is very well-designed and works well on both your phone and tablet. Here's some of the 
things you can do from the app:

-Change mode between Home and Away.

- Initiate Nest Protect sound test, checkup

- Silence alarm

- Change Protect location (family room, bedroom, 
etc, for accurate communication)

- Adjust Nest Sense:

- Toggle Pathlight to light your way when you 
are under Protect at night

 - Nightly Promise (Unit self-tests and gives 
green "OK" light each night)

- Steam Check (reduce false alarms on steam, 
good for units near bathrooms)

 - Heads Up (less loud & annoying pre-alarm 
warning when rising CO levels detected)

- Adjust unit LED brightness (low, medium, high)

- Change language (English, English (UK),
Spanish, French, French (CA), Netherlands)

- View unit status (model, serial, software 
version, battery status, replace date, last update time, wifi MAC/IP addresses)

- Add/remove devices to your account

- What To Do (advice on preparing for CO/fire 
alerts)

- Device History (logs on alarms and updates)