Two different probes with two different temperature settings because Dad doesn't eat turkey so you have to bake a ham, too. The remote control means you can watch the parade in the living room and still know when "it's done."
You can't roast a turkey and base it on the "recommended" time for cooking. The only reliable way of knowing when you're turkey is done is with a thermometer. This one lets you check temperature on two things at once (in case you have to make two turkeys), and also has a remote control so you don't HAVE to babysit the bird in the kitchen all day long.