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: how long does the battery last?
Document: The battery really last a long time. I like to read in bed at night and don't have to have any other lights on. It is nice a bright and I can point the light right were I need it.
These were bought as stocking stuffers or fun party gifts. I tested 2 out and they give a bright light.Who knows how long they will last but for the money, a bargain.
For the money, you won't find anything that does the job better. LED light is bright enough to read or have as a nightlight. Uses 3 readily available AAA. Would like to see fewer batteries, but then I suppose the LED wouldn't last as long. Perfect for kids or adults. The clip has a flexible fulcrum on it with a pad for easy installation on a bed or a book. Flexible arm is metal not plastic. Button seems solid enough, time will tell.
i bought these to use at a holiday craft show i'm going to participate in. the show will be outside in the evening, and when i went last year the lighting wasn't so great. so i though i'd get some light-weight, battery operated lights that i can clip onto my display so my items will be easier to see.
Nice little reading light for my first generation nook - nice and bright - and long lasting battery wise. Nice that is has the adjustable wand - no problems iwth the battery door as long as you are careful.
Kids love em for reading at night. Batteries last and last. Lightweight and very bright! You won't regret this one!
These items were to be clipped to our music stands for candlelight ceremonies. They worked perfectly and were veryreasonable. Best of all, they came the day after I ordered them, which took the pressure off of worrying about last minute items.
What more can you want out of a book light, I clip mine on my laptop, Ipad (with the cover attached), books and they even stand alone. This is defenitley not going to be my last time ordering these lovely little things.
Regardless, the triple As hold charge for quite a while as long as you aren't using this for prolonged periods every day.
Love the bundle package for the great price!!! Perfect for studying at night without needing a big light on!! Helped me through many long nights of online schooling! !
Answer: Hard to say. I use it to light my keyboard when I'm on my computer in the dark. It's lasted me for about 2 months now, but when I use it I usually only use it for up to an hour and I do use it quite often though.