change the shape of the horn to produce infrasound or frequencies too high to hear, like a dog whistle.
the device is now 'silent' to the unaided ear.
No silencer needed.
1. change the shape of the horn to produce infrasound or frequencies too high to hear, *like a dog whistle*.
2. the device is now 'silent' to the unaided ear.
No silencer needed.
I will take one that produces the brown note, thanks. Also I am going to need solid earpro.
I will take one that produces the brown note, thanks. Also I am going to need solid earpro.
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