Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Does this have an automatic SOS feature?UPDATED: Got the answer, thanks.
Document: I cant say anything more than what other 5 star reviews have said about this flashlight.I bought two from amazon and i am so happy i did , great value for money and excellent quality, i also got extra button and "O" rings for the flashlight, which really surprised me.Thanks Fenix
I got my E21 about a week ago, and it's still going on the first set of batteries (I use it every day). The 150 lumens (on high) runtime isn't exaggerated like some makers; it's really 150 lumens. Twist the head to switch between high and low mode, click for on or off. Very simple and effective. You can also half-press the tailcap switch for momentary on, and this can be your SOS/ strobe mode if you move your thumb fast enough.
This light is not focusable, which would be a nice feature, but that is available in other models and at this price point the E21 is an outstanding light.
Great flashlight. Works with two rechargeable AA batteries.Very bright. Many flashlights are AAA, and AA are so better as a rechargeable batteries, so this one is my main flashlight in my toolbox. Thanks.
needed a Strobe or an SOS flashing flashlight, so this basic Hi/Low brightness flashlight meets my needs perfectly, and at an excellent price point. Based on my experience with this light, I highly recommend it.
Awesome little flashlight. The batteries last forever. I really like the form factor and the water proofness. The high to low feature is kinds lame but oh well.
For the price, I feel like this i one of the best things I have bought in my career. I have used it so many times, and I can constantly rely on it working. I love this light, and I will pull it out on calls just to use it. Love it. Thanks Fenix for making an amazing torch!! !
I will probably order a few more of these for around the house and work.The only negatives I can find with this light are what others have already brought up...No belt holster and no anti-roll feature. I can simply fix both of these problems however. Oh, the one other thing that kind of burned me was the fact that the flashlight didn't come with batteries.
It's bright, looks great. For a few days the switch would only engage to constant "on" one out of every 20 tries. Eventually playing around with it revealed that the end cap was not screwed in tightly enough - problem with switch solved! The feature claimed of two light settings, by loosening or tightening the light end, doesn't really do much. But, it's a nice, bright LED flashlight.
Second, it must run on a common battery type (sorry CR123, maybe next time!) Third, it must allow me to determine brightness before turning the light on. The latter turned out to be surprisingly difficult.Enter the Fenix E21...Quality-wise, this thing feels built like a tank and thanks to IPX-8 waterproofing, should be much more resistant to moisture than the EO1.
Answer: yes