Any recommendations for a safety strobe light for kayaking/canoeing?

I presently have an old Seattle Sports Hydrostar but for the life of me cannot figure how to change the batteries. I don't even remember what batteries it takes, yet it currently still functions.

In October, I'll be spending a couple weeks on the Outer Banks of North Carolina (Avon, NC) and will be paddling virtually every day on Pamlico Sound. We stay pretty close to shore but, not surprising for an ETSer, I'd like to be prepared for the unexpected and unlikely.

I'm looking at this updated version of the Hydrostar but would like to do more research before buying it. When not paddling, like its predecessor it will be stored in the car.

http://www.seattlesportsco.com/paddling/hydrostar-sos-seastar-deluxe.html


Some crummy reviews on Amazon:

http://www.amazon.com/Seattle-Sports-Hydrostar-Seastar-Deluxe/dp/B00CSUENN0/ref=pd_sim_sbs_468_5?ie=UTF8&refRID=0E00FJH35X9KHXQN7ANF&dpID=41MZ9db6xSL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_


.