There's been considerable discussion of these plugs. Search the forum & see what pops up. Just remember to set it for all dates.

I keep several pair in my truck, for multiple reasons. One use someone else pointed out is for use in an evacuation/shelter scenario, where you are in a community shelter (for what ever reason) & need to sleep. They'll help cut down the ambient noise. A sleeping mask is a possible item, too--though in a BOB, not a PSK. <img src="images/graemlins/smile.gif" alt="" />

David