Re: Your opinion on this zapper please

That makes sense, but for those non sweeping zappers your maintaining one single frequency, meaning that it might kill those parasites within the frequency range but not other.
If for example a parasite vibrates at 40khz (random number); which zapper would do a better job, a zapper that is constant 7 minutes at 30khz, or a sweep zapper that sweeps between 25 and 35khz for 7 minutes. Sweep zappers might not keep at a certain frequency for long period of time but are continuosly on.
Just trying to understand.
Thanks
Mike