Question 1

is this battery operated?

Accepted Answer

No, it plugs in with a 6' cord.
it's tiny and needs to be placed near your bed. Not noisy.
night light can be annoying.

Question 2

what is the usage watt?

Accepted Answer

I did not put the wattage meter on it to test. The unit cannot be pulling much. The wire is thin and ac adapter is small.

I rated this unit 5 stars BUT I have to take a couple of stars away. I use this by my desk to get some humidity. I live in N.W Indiana and the weather has been extremely cold" O degrees 
I have to change the bottle every 7 hours to keep humidity around the PC area. This unit uses a regular water bottle 16.9 oz.
 A few days later I purchased a SPT ultrasonic humidifier that has a 2 gallon tank, it ran 32 hours. I had it on full blast. I wouldn't have purchased the personal humidifier if I knew the output was tiny and had to change the bottle So often.

Question 3

Can you use a glass water bottle with it? I like to avoid plastic bottles.

Accepted Answer

Personnaly never tried a glass water bottle.  It would fit and weight should not be an issue. I use only distilled water in mine, works fine.  Plastic is light weight and not hard to refill the water bottle.  Glass would be a better quality, and it would work no problem, just add a little weight, as long as it is 16 0z or less, it should stay stable.

Question 4

Does it require distilled water, or is tap water ok for use?

Accepted Answer

It says you should use distilled water and I wish I'd known that.  I have to remember to get some and save my other bottles to fill with distilled.

Question 5

How large a bottle can it take, and how often will it require refilling at maximum power?

Accepted Answer

Hi: I've been using mine for over a week now. It takes a 16.9 bottle which is what most stores sell. I'll fill mine up before going to bed at 11pm and it will be out by 6am at max.

Brand	Bell & Howell
Model	8662
Type	Humidifier

Color	White
First Listed on Newegg	November 05, 2013

Bell & Howell 8662 Sonic Breathe Ultrasonic Personal Humidifier

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Item#: N82E16896215001