What accessory would you suggest to get your "buddies" attention. I recently descended with a woman that used her hands to pull herself forward in silt to get moving forward then really blacked things out when she started finning. Never looked back. I obviously lost her.

I have a Diver Alert but not the kind that sounds underwater. I want something easy to use, loud, and fast. I don't want to be searching in my BC pocket for it. Would a tank banger do the trick or is there something better?