Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Hi, How does this turn on and off. And can it be used underwater? Thanks, Ed
Document: Wow--What an excellent product! I bought it for my Hobie Revolution Kayak. You may scoff at the price at first as I did. But if you do your research you'll find this is the best option. The flag doubles as its storage bag and it breaks down much like a tent pole with elastic between sections. I use the padded base and stick it into my back extra rod holder. I have a Scotty flush mount I will be putting in the way back.
Works great,folds up into a nice pouch which also doubles As a flag. The light is very visible at night,and the battery does last for a very long time the price is salty,But if you want to be seen at night this is it. Well made.
They are also working on their own proprietary mount system, as well as a system for taking self-photos, like when I catch a fish! Excellent company--I can't say enough good things about it. I found the mass produced options cheaply made and a compromise.
I already had the Scotty base mount on my kayak and Hobie store only carries the rod holder flags, so this was a much better purchase for me.
Bright colored flag,a nd bright light. We plan to use this on all of our kayak trips now. Too many times we have almost been run over by airboats that just didn't see us, and there was no way they could have heard us.
Awesome! Easy to install and use! Love it.....  Everyone out on the water needs to have one, can't put a price on safety!
Answer: no