Official With Electronic Whistle

[Hornets222003]

I'm out of town and decided to take in a high school playoff game. On the first call that the C makes, the players hear the whistle pretty easily, but I don't hear anything a few rows up in the stands on the opposite side. After a few minutes of wondering why I didn't hear the whistle, the crew goes through a few rotations and the same official is now C on my side. And I see why I didn't hear it. He doesn't have one. Or rather, I see a gadget in his hand and I realize that it is an electronic whistle with a medium volume and not-so-sharp tone. It was set to give a 5 second blast of tweets.

This was a first for me. Have any of you ever seen an official use an electronic whistle? I've searched the Rules book and I couldn't find any, but are there rules against an official using this type of device during a game in your own associations?