Shaker Scuba phone (Indestructable)

How do you get your buddy's attention, or help from others?

Give ReefNet's new "H2YO" a shake to emit a loud and distinctive rattle that can be heard at great distances underwater. To make sure you sound unique, H2YO is offered with two sounds:

Colours: Yellow, Orange

The benefits. 
There are many reasons to use an H2YO instead of alternative signalling devices:
It can't be forgotten on shore/boat like a tank banger since it stays on your BCD.
It doesn't require an air supply like many other noisemakers
It doubles as a gear identifier (different colours for different people)