Yes, great idea. Reversing alarm. I can hear those well enough on trucks, buses, etc. I'll look for one in the UK. I'll try to find one with the frequency listed too, because I just did a quick test, using a youtube video, and it would seem I have lost both high and low frequencies. I hear nothing until 200Hz, and it's gone again at 5KHz. About 800-1000Hz, is still very loud though. Of course I don't know the frequency response of my PC, but at least I now know I can hear 800Hz very well.
Thank you for pointing me at these. I had been searching for beepers, or buzzers, without too much success.
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