First, Walkers are a good brand, they make a quality headset that works well for noise reduction. The walkie-talkie uses FRS/GMRS channels, so it would be compatible with other FRS/GMRS radios. Don't believe the range values they're advertising, more realistic value would be maybe a mile in typical rolling, wooded terrain. In an AO like Johny has, or we have down here in TN, you might get just a half mile. The price is pretty good for what you're getting.
I use a similar set-up with an external radio when I'm mowing the lawn, or working out back, so my wife can reach me. It is handy, but you need to understand the range limitations. Plus, anyone with a FRS/GMRS radio can listen in, so there's no privacy.
Thanks for posting that, I may pick up a pair... Edit, I did order a pair.