The walkie talkie also features a "telescopic Rod antenna," a "push-to-talk switch," a "speaker-microphone" and a "green/red alert signal button," among other features. This is so you can instruct Spock just to beam up the landing party, and not the Klingons, vis-a-vis "Day of the Dove," I guess...
In terms of fidelity to the original prop seen on the show, this toy communicator doesn't rate particularly high.
This communicator is blue, larger than the device seen on Star Trek, and the flip-up grille is emblazoned with an Enterprise logo that wasn't on the communicator on TV. Still, who's to complain?
I can remember spending literally DAYS playing with these walkie-talkies communicating back and forth on a "landing party" on the wooded trails near my house in New Jersey.