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: I just received mine- is it supposed to making a hissing / crackling sound?
Document: Mine--like many peoples--stopped working after about two weeks. Luckily, I did not miss the return window like some less fortunate souls. I was under the impression it was genuine lenovo brand product. I received the three prong unit and actually got all required cords and such.I don't think mine worked long enough to catch fire but it DID become so hot that I felt it necessary to unplug it every so often.DO NOT BUY.
Wanted to have an adapter at home so I wouldn't have to schlep mine back and forth with me from work. Super-easy, convenient, cheap.
the product is working perfectly and it is exactly I needed it. I Would recommend to anyone with a lenovo laptop like mine
I was in desperate need of a new charger when mine went bad. I love that this charger has a three prong connection to both the AC Adapter and the wall.
It looks like an Lenovo product but I am not sure. Mine worked for one year but always made an unsafe and cheap impression. It will get *very* hot so be careful not to touch it.Update: This one only worked for a few months and is not charging my laptop anymore...
I got it in December 2012, and today it could not work properly. It made my battery keep being charged intermittently, with the sound of ticking again and again. Very disappointed.
I purchased this charger in March of 2013 and now in November of 2013 my charger suddenly stopped working for no reason. One minute it was charging my computer I left to go eat food and a half hour later it had stopped working. I am really upset because my charger before this had lasted for 3 years not several months. I also know that it is the charger and not the computer because I am using a friends charger to charge my computer since mine is now broken.
It's new and in good quality when I received it. Hope it can keep on working for a long time. ^_^
I received this product and it works fine. It is the same product of the description and now I have a month with it without any issue.
I did not receive what I ordered, I received a 90W 20V AC adapter which is not what I ordered and missing part of the cable.
Answer: I had the same hissing for the first few days.