Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: litecoin
Document: this item is the best miner out there for the buck. right out of the box effiency is 98 to 102 % hashing between 10 and 11GH
[...]
[...]
You will need a power supply for each unit that you connect, 100watt should do very well for these 83 watt devices. The setup is incredibly easy, and there is no need for a server to operate them.You dont need to know how to solder, or do anything difficult, just need a flathead screwdriver and the ability to strip a wire.
You have to know how to use it and even then there is some pain.Had a couple of issues that I ironed out but Jones responded quickly and offered to replace things if they were bad.Great service and a good product. Not vaporware.Don't think this is a plug and play though - do your research.
Works like it supposed to. Average 10.4 GH/s on eligius pool through local stratum proxy. This model isn't overclockable, but still worth buying.
Works as advertised.Pros: quite stable, simple web interfaceCons: Proxy required, high heat emission, non-overclockable (like rev 1)Main issue is constantly rising price.For $600 definitely bad investment. Will become piece of junk with next 2-3 levels of difficulty, for bitcoins.
Works as advertised.
Without trying very hard, I found a block erupter cube on a certain popular auction site. 38GH/s, including power supply and cables. More than 3 times the hashing power, but only twice the price (less than twice the price really since  I didn't have to buy anything else with the cube).There are much better deals to be had if you look around, sorry to say. But I'm sure someone will buy this not realizing that they won't make their money back at the current prices.
With the bitcoin difficulty level increasing so rapidly, this device will never pay for itself. Even if you can get it for $150, the most you're ever going to earn after recouping the cost is probably less than $10. By May 2014, you'll spend more on the electricity to power this thing that you'll get back in bitcoin. Run away!
Answer: no