Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: What is the capacity? Is the whistle shrill or harmonic?
Document: I think my title says it all.All steel construction. Feels weighty and solid. I don't see any plastic anywhere Shiny Polish. Hasn't developed haze or patina with use. No rust.Large capacity holds plenty of water.Boils quickly because of large flat baseSoft whistle. Loud enough but not shrill/shriekingHandles get hot. Spout cover gets hot. Use a towel or let it coolLid fits snug and doesn't fall when you pourSpout cover stays open when pouringThere are some cons though.
As with everything All Clad this is a quality piece. Beautiful out if the box and large capacity.It whistles at boiling and has a large top opening so it's easy to fill and clean. Looks great on my stove top!
We had ordered another brand of tea kettle and had to return it because it didn't pour properly from the spout & leaked hot water all over. It also had a smaller capacity for the amount of water. This is very well designed & has good capacity!! All Clad makes very good, well designed products.
I would not recommend some one who likes Tea Kettle with whistle like me.
The handle gets too hot to touch. Poorly designed, after 4 weeks of use the whistle no longer works. All Clad usually makes a great product, but not this time.
It was bigger than my last tea pot and I like that. Also like the stainless steal. What I didn't like is the whistle top doesn't fit right so I can't hear it when the H20 boils.
After a long time of searching for the right teapot, we found this!This teapot is exactly what we wanted. It works on an induction stove, it is large enough to fill a pitcher of water, it's whistle is audible and it is well made.
Like my new kettle .... be nice if it were a tad smaller ( 2qt !!! ) with a handle that wasn't so hot.Bright side ... nice kettle, no rust, boils quickly,whistle works, looks great and I'd buy it again.
But it has a spotty look (maybe from cooking oils on the stove nearby?) now. I'll have to try a more aggressive cleaner on it.Of course, there just aren't a lot of good tea kettles to choose from. This one is all metal (no plastic to melt) and has a good whistle.
The tea pot is the perfect size, heats the water fast, the whistle is not too loud to wake up the whole house and most of all I love the way it looks. Very seldom is the handle too hot for me to handle... all around great tea pot.
Answer: 2 quart.  It is good sized.  Does not look small on stovetop. Also not huge.   Whistle is harmonic, not shrill.  I will tell you that I am sending mine back as it does not always whistle--usually does not.  I see a number of other reviews that say the same thing.  I would try something else but after much research, I still believe this is a great product.  Others are cheaper but I don't want rust or particles in my water.