Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: I am confused- how exactly does the milk frother work? Is it connected electrically to the machine to make hot milk?
Document: We  love this machine and we love the coffee!I chose the Nespresso Citiz because you can make cappuccino and have nice foamy hot milk with your coffeeIt's easy to use,fast and very easy to clean. I love the contemporary design and it doesn't take much space inOur small kitchen. The coffee is really tasty rich,not heavy burned sour taste.
This machine is fun. I never go to coffee houses and don't really drink espresso much, but I do now. My friends version has the frother separate, which I might like better. I have room on the counter for so it doesn't matter. The frother is very easy to clean and does a great job on milk. I thought 1/2 and 1/2 might also work, but milk is better. I usually do the Lugo, which makes about a 1/2 a mug of coffee.
This device makes fine espresso and is easy to use, both with Nespresso capsules and compatible capsules of other brands. A problem, however, is the milk frother. It raises the temperature of the milk to lukewarm at most. By the time I pour the milk into the espresso, the drink is tepid. To get the coffee sufficiently hot I have to heat it in a microwave for about a minute (at low to medium setting to avoid boiling over).
My aeroccino frother which unfortunately is connected to my nesspresso QUIT working after 2 years. The rep at nesspresso said she gets a lot of calls about them,they tend to &#34;short &#34; out. I wish I would have gotten the one without the aeroccino attached. You can just microwave the milk it turns out the same,the nesspresso adds froth. Also I'm not very happy about how they keep raising the price of the capsules!
The Nespresso system is great! You can program how much water it dispenses for regular and longo capsules with an automatic shut offThe milk mixer and frother is awesome for both hot or cold milk recipes. We love it!
Comes with a recipe pamphlet. So easy to make. Love the frothing unit connected. Unit is compact & fits well in a small kitchen.
great machine but quality has been an issue. had to return the first one because it wasn't puncturing the coffee modules so only water came out. the second one wasn't dispensing enough volume so I had to clean it repeatedly to get it working even though it was brand new. makes outstanding coffee however and i like the variety of coffee options available. The frother works very quickly and quietly while producing excellent foamed milk.
We happen to drink decaf so that limits choices, but we like what is available.The frother is easy to use and easy to clean. Some brands of half and half won't froth, but all heat well. It is incredibly quiet having gotten used to steaming our milk with a manual espresso machine previously. This unit looks good and lives on the counter. It is well made and has worn well. I highly recommend the Citiz espresso machine!
Nespresso D121-US-BK-NE1 Citiz Espresso Maker with Aeroccino Milk Frother, BlackI bought a machine very similar to this one nine months ago. For six months, I loved it. Then it began not puncturing the pods. I tried to get the Nespresso people to help, but none of their advice worked. I kept using the milk frother, but a week ago it stopped working. I cannot recommend any Nespresso product after this experience.
The coffee is amazing and the frother works great. My only complaint is that it's not very hot. But it makes a very quick cup of coffee and the taste is better than my regular coffee brewer.
Answer: The Aeroccino is a separate piece that sits on the stand and powered by the stand, It is activated separately from the brewer, there are 2 frother heads that are included, one for high froth and one for low. There is storage in the stand for the heads when not in use. The Aeroccino is a great milk frother, it produces hot or cold frothed milk all in about a minute. It is easy to use and clean, the milk is hot coming from the unit not lukewarm. If purchased separately it is $99. I do not think you will be disappointed with the Nespresso machines, they are by far the best pod system out there and I have owned them all.