Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What is the PSI? Can it cook 2 different pressure levels?
Document: And in spite of what the myriad of reviews say about a lack of hissing/noise I am told this is normal.I've tried it on 3 different types of cook-tops: gas, glass-top electric, and induction. I get the same results on all 3 regardless of power/heat settings.
Of course, you have to include 1) prep time (which is true no matter what method you use to cook a meal); 2) time to get to 15psi (about 5 minutes with 1/2 cup of water) and 3) natural depressurization (take it off the heat and let the pressure fall naturally) (this recipe warned against quick or even slow release) which took about 10 minutes.
I initially ordered an electric pressure cooker that seemed to have all the bells & whistles. Before it came, I learned that most electric cookers cook at about 2/3 the pressure (10-11 psi) of stovetop cookers (15 psi). I returned the electric model unopened and ordered this cooker, and I'm so glad I did! It's well made and fun to use.-- This is the Top model, with a fancier lid.
Wow. I needed to buy a pressure cooker and started my research reading all the reiews on Amazon from the Presto to Kuhn Rikon models. There is a saying that you get what you pay for: and this could not be truer. I make a lot of soup that normally takes over 2.5 hours of cooking time. And with the pressure cooker: it took all of 30 minutes to cook and then it took another 10 minutes for the de-pressurization process.
Not your mother's pressure cooker!I grew up using a Mirro pressure cooker, but when I decided to buy one I wanted a small, non-aluminum one, so swallowed hard and plunked down the bucks for this Cadillac model. What a fine item! I've made fresh green beans (under pressure for 2 minutes!) and cook chicken breasts for chicken salad (10 minutes! ), usually don't even need to have the heat on once the top is sealed.
It just about as fast using the pressure cooker as it is to make instant mashed potatoes in the microwave.I cook pot roast, chicken cacciatorre, stews, soups and especially bean dishes and brown rice. I turn the heat up to high until the second ring is exposed and then turn the burner down to the absolute minimum. It really does save a considerable about of energy and time. If you have a family of 4, get the 2.5 L frying pan. You'll never regret it.
This is an essential piece of kitchen equipment. I use it several times a week for everything from making dog food to stews, cooking beets, etc. I work 6 days/week, and when I get home, I can have a great dinner within an hour or less - and that includes preparation time. I have also used it for making amazing chutneys that otherwise have to cook for hours. With this pressure cooker, it's all done within 1/2 hour.
How did I live without this? I don't know. We liked it so well, I also purchased the 5 qt because I found that I wanted to cook more things simultaneously. Pro(for this model): 1) outstanding pot quality, 2) size is great for stock, risotto, stews, chilis and artichokes (I can fit 3-4 in this size), plus our favorite, veal/lamb shanks.
I really love this pressure cooker but then there is nothing not to love about it! It is quiet, easy to regulate and clean up is a whiz! I have owned many different pressure cookers over the years from electrics to the Presto jingle on the top variety but this is by far the top of the heap or Rolls Royce of pressure cookers.
I love this food pressure it is fast and so quiet. I always use pressure cooker almost for all beans , meats and stews . I have had different brands such as Lagostina and WMF but I love this one . I recommend it to everyone who need a really good Pressure Cooker.
Answer: PSI means pounds (of pressure) per square inch, I believe.  So the higher the number, the greater the pressure the cooker can withstand.  Yes, it can cook at 2 different pressure levels.  You will see a red line appear on the pressure gauge as the cooker heats up.  Some foods must be cooked on the first red line, such as rice.  Other foods need to be cooked at the second red line, such as beans.  The Kuhn Rikon pressure cooker has an excellent book that comes with it which explains these things.  I have not been disappointed in my Kuhn Rikon.  It is quite sturdy and saves me time in the kitchen.  I really don't know what I did without it.  Hope this answers your question.