What does the hi-lo siren sounds like?

The hi-lo siren produces a distinctive alternating high and low tone, creating a sound that rises and falls in pitch. It typically features a rapid oscillation between the two tones, which can be alarming and attention-grabbing. This siren is often used in emergency situations to signal alerts or warnings, making it easily recognizable. The effect is designed to cut through ambient noise, ensuring that it is heard clearly.