Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: How long the batteries last?
Document: These Worked Very Well For Me. I Now Have Them In My Whole House. It Has Made A Difference In Temp In My Upstairs. They Are Cheap, Simple And So Far I have Not Had To Change Batteries Like Other Reviews Said, And I Have Had Them Installed For A Month Now.
We have a computer controlled home by HAL2000. But the HVAC vents are not controlled. This allowed the control of one side of the "L" shaped home while staying in the other and vise a vesa. Great product and energy savings for sure.
These vents are so worth the price. They are easy to set up and easy to open/close if you change your mind on the timed settings (so if you are home sick, for example, and you have the vent closed in your room Monday through Friday between working hours, you can override the setting and open it up). Great product. Looks nice, too. Not cheap. And the programmers can be removed so you can really control the settings in a room if you want!
In my opinion, heating cost is major concern of A/C system for single house. This is the one to save your money. We bought four for each room including living room where we don't use in bed time; however, one drawback is you can't use Low self-discharge NiMH battery such as Sanyo's eneloop, because of insufficient voltage. You must use regular battery on it.
I purchased three of these vents for the kids rooms and one for the restroom so I could close their vents while they are at school. In theory I would be closing there doors and in return be heating less square footage while they are at school. While it is to early to determine if I am saving any money I know that the wife and I are now more confortable due to the heat distribution and also notice that the heater is not kicking on as often as when I have all vents opened.
I purchased the vent miser when they first came out. I didn't know if I would actually use them or if it would save $$$ but I set them up (EASY!) and they actually are saving me about 30% of my energy bill.Every bit helps! I am ordering more for my summer house!
Answer: no