Motorola Milestone 2 :: Playing High-pitched Sounds For A Long Time?

I've found in the Market many apps named like "Anti-mosquito", which claim to be able to keep mosquitos away: indeed, they achieve this by playing high-pitched sounds which are annoying to mosquitos and - yes! - they work.

Of course, this can be done by just playing repeatedly high pitched sounds, which, depending on the kind of mosquito you want to get rid off, may be in the range from 14 to 25 KHz.

Since I don't know whether playing so highly pitched sounds for a long time could damage the phone, I've asked the Italian support. They looked confused, indeed.

At first, they asked which app was I asking about and said that, anyway, all apps from the Market "are developed and managed directly by Google" (sic).

Then, when I pointed out that, put aside the fact that apps in the Market are not being developed by Google, I wasn't talking about apps and software but of particular sounds and hardware, they escalated the question to their technical department.

I was asked again which app I wanted information about (!!) and then, after telling again that I meant nothing more than playing a 14-25 KHz-pitched mp3 for a long time, they answered that no, that may not harm the phone but they couldn't be 100% sure.

I've asked them about the audio playback hardware, about who produced it and whether those latter could answer. The final answer, that they suppose is enough to close my ticket, is that "nobody could say for sure that playing high-pitched tones for a long time wouldn't damage the phone".

This is a nonsense to me, since hardware must have technical specs. Does Motorola International have got a better answer?