i went to a clinc and they had a couple of those that you could try out. it was by far the easiest to use. the really wierd part of it is the heartbeat option thats on it. if you think about you can see who is alive or not. kinda wierd to think about. it was the fastest in the multiple burial by far. as soon as you locate one, you can push a button and then it stops displaying that beacon so you can locate someone else easier. plus its got a compass and other pretty cool stuff. if i buy another beacon, it will be that one.