I was in the city today and found a light very similar to the Life Gear one.
This light is a
Garrity Battery Operated Glo Lite and it cost $2.00 at a discount store.
I just now opened and tested the green version and it throws more light than a regular glow stick, with an easy on/off switch, but no built-in whistle.
The light is sealed with an o-ring so it cannot be disassembled for use as a white LED light and it comes with a break-away lanyard.
The packaging states that it is good for 24 to 36 hours, I will probably buy a few to use when the boat or trailer lights give me problems.
Thanks for posting them TeacherRO, I would not have known what they were if I had not read your post.
Mike