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Yes, these walkie-talkies are official. They’re from the era when the show was first a big hit in the US on Cartoon Network and they were milking the license for all it’s worth, resulting in more weird shit like this. I remember seeing them in toy stores. However, there are two other walker talkies taped to the back of them.
Here's another kicker: You see the speaker in Vegeta's armor? Well, the mic was placed right in the crotch.