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: Does anyone know what the purpose of the plastic tube shipped with this flashlight is for? It was packed outside of the box with of the 4 I bought.
Document: I bought this Meco Mini Cree led flashlight because I needed a very small flash light. When the light was delivered I was really impressed with the quality of the craftsmanship plus the brightness of this very small flashlight.It has a full focus, so if you need a wide blast of light or a fine small stream this light delivers on both. The price is the best thing of all for a true quality flashlight.Going to order a few more for family and to put in my tackle box.
It also has a  spotlight option by pulling on the front of the flashlight. It beats all those other flashlights you see in front of cashiers at the big box stores or even at the little mini marts with the gadgets they sell. I bought one and loved it so I ordered 3 more. Some places may or may not have the strobe and low light output option on their flashlight but not a big deal. Main thing is that the bulbs don't burn out fast like the expensive ones that I used to have.
However, the build quality is still good enough at this price. I've had no problems with them. I've given several of these to friends and family. They all seem to like them. I'd recommend these to anyone at under $4 USD, but I prefer the 3 mode model while the price is nearly the same.
The focus function comes in very handy when describing an object more that 10 feet away, just describe the object while zooming in on it.I bought 4 of these in the in my last purchase and now with 6 of these flashlights flashlights I can keep 1 clipped to my backpack, my significant other can keep 1 in her purse, we can each have 1 in our cars there will still be a couple around the house.
I bought several of these sturdy one mode clones of the Sipik SK68 flashlights from MECO through Amazon.com. All of them have functioned perfectly. They are inexpensive (under $4 USD and free shipping) and bright. The lumens ratings on all the Chinese flashlights are wildly exaggerated of course, really probably 100 lumens, but plenty bright. Conveniently sized for every day carry. Capable of using common AA batteries, or Lithium Ion 14500.
I have purchased 3 sets of 2 lights of the following colors Blue, Black and Red The first set was Blue what an awesome light for the price. I was so impressed I followed up by buying 2 Black ones. The Black ones sucked . I had to tap it a couple times to get it towork. They went into the drawer . I bought enough Chinese products to know you get Awesome or Crap .Even if you order the same item.
great -great light--have bought some for everyone i know CAUTION--avoid the 3 mode type--which have a high--medium and strobe setting---single mode cree light is best--get minimum 300 lumens--and AA batteryyou will love it
Four stars for me- it's a really cool $4 flashlight! Too bad I couldn't send them pink money.
I have no idea what kind of battery it uses. No instructions came with package. Does anybody know what size battery it uses?Changed my review. I found out what size battery it uses. Flashlight does what it says. Small but powerful.
I had a little trouble opening the battery compartment,but with help of Amazon purchasers of this tremendous  Cree flashlight, I did load the single AA battery required to work this flashlight. I must say I was very very surprised at the power of the illumination this mini Cree provides! I gave one of the two flashlights to a neighbor who also was very impressed with this product. I shall be ordering two more in a few weeks . I do recommend this very excellent flashlight to anyone!
Answer: yes