http://www.walmart.com/ip/Midland-WR120-Weather-Alert-Radio/16451519Electric with battery backup. We leave it plugged in all the time.
You can either leave the counties on "all" or program specific counties. At home we program our counties. When we travel we leave it on "all" counties so we have more warning. It has S.A.M.E technology.
When you arrive at your destination, you scan the channels for the one with the best reception. Very simple. It also has an alarm clock.