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: Is this light approved as a USCG Visual Nightime Distress Signal and does it flash an S.O.S. signal?
Document: I like the battery life and the brightness. The LED enables the long life so I'm ok with the color range of the strobe. The unit feels very well made. I have a feeling that if they wanted to, they could make this unit less than half the size, run it off a AAA battery and still exceed USCG regs. I really like the wire that helps you remove the two batteries, and the double O-ring feel.
The strobe seems to work fine and will probably flash for hours with the lithium batteries (extra). The clumsy and not secure attachment ring/tab, whatever it is called, simply doesn't hold and it falls off at the slightest provocation. Will have to figure out how to attach it more securely to my PFD, with the strip of velcro that was provided.
The design is not the best, but it has a sturdy construction with precise on-off switch. Light is very, very strong.
For the cost of this item, it works very well, built tough, easy to operate. The most attractive point is that the sourse of light is LED, which consumer much less power, extending the life of the batteries. Great Buy.
When I fly my MTO Sport Autogyro on floats, I needed to have an inflatable device and the flashing strobe is a must to have beside it, so this unit is small and light to carry inside the lap of the surviving floating device.
It really does what it has been advertised for. Over all the product is great and has no problem with it except of course after inserting the battery in which I was having a hard time re-aligning the lid to close it. But over all the light is bright enough that when we tested it in one of our back country outing, about a few miles away my friend can see it. Thanks.
A buddy and I will kayak around the entire state of Florida this fall along the Florida Saltwater Paddle Trail. I wanted a strobe to attach to my PFD and after a bunch of research decided on this one. It's constructed well with tight waterproof seals. I like the automatic or manual activation settings. It comes complete with attachment straps and a lanyard. I rigged it over my left shoulder strap for easy access. BTW, it works great. Bright strobe with good flash frequency. It's a keeper.
Now that I have the device in hand I notice it does not have a three position switch (Manual - On, Manual - Off, Auto - On/Off), but it has a two position switch (Manual - On, Auto - On/Off). With this configuration you cannot keep the light turned off manually. I can't see any sea kayaker who practices rolling or wet exits on a regular basis purchasing this light.
Great quality product. I placed the strobe light in a pan of water after installing lithium batteries and, it started strobing. Seems like a very well made light and I love the small size, I have a self inflating vest and this fits underneath the velcro flap and you don't even know it's there. I would buy again! !
I purchased this strobe based on other positive reviews. It is a high quality construction, reported battery life is good, and the strobe is bright. As with almost all of these strobes, the size is just a little bulky. It does fit inside my Spinlock vest, but I wish it was a little smaller. I also couldn't figure out the clip for the inflation tube-ended up improvising the attachment. All-in-all, its a good light and serves its intended purpose.
Answer: no