I hope this is the right place to post this, I tried posting in the PC Hardware section and got no replies. Please tell me which forum is better. I will follow this question, so please ask if something is not clear.
I have had a device made that emits 20KHz - 22KHz (very low frequency) and...
The kilohertz, abbreviated kHz or KHz*, is a unit of alternating current (AC) or electromagnetic (EM) wave frequency equal to one thousand hertz (1,000 Hz). The unit is also used in measurements or statements of signal bandwidth.
Source: http://searchnetworking.techtarget.com/definition/kHz