All of siren devices made by Orchid are with the circuit designed built-in for anti-squelch circuit to prevent screaming and wavering-control under voice of great volume operations. With Wail, Yelp, Hi-Lo, Kojak sirens and air horn, and sirens or air-horn activates via an auxiliary switch such as horn ring button of steering wheel. Push-to-talk microphone overrides all sirens, by pressing the microphone button any siren-tone is disabled, releasing the button allows the siren-tone to resume.