Years ago, I did some research. Now, I'll try to only buy walkies that run on 3 AA cells, not four AAA cells. Much more power in the larger cells. That said, I bet those work nicely. The actual range is probably half mile, under normal conditions.
Something I like to do. Put the other walkie out a ways, and talk in the top, side, center, etc. While transmitting. Find the microphone, and talk into the mic. I was out at a historic site with some friends and trying to talk to their seven year old boy. I couldn't hear what he was saying. I traded radios, and tried that. I found the mic, and told him to talk into the mic. His reply was "Oh, I do it like this" and proceeded to talk into the speaker. It was all I could do, not to whack him in the head, the clueless little idiot.
I did use FRS sets on the job a while back. My boss would get a phone call. He'd turn off the walkie, or walk away and leave it some where. The clueless big idiot. I found it easier to call on my cell phone, and the walkies didn't get much use. FRS set is a lot cheaper in the long run.