Description

Since January 1, 2023, all backup alarms on NYCDDC construction sites must be  multi-frequency, or "white noise" type.
Multi-Frequency back-up alarms provides a solution to potential noise pollution created by conventional tonal back-up alarms in confined or densely populated work areas. Those Multi-Frequency alarms maintain a safe warning signal for those in the danger zone of backing vehicles while
minimizing disturbance to work site neighbors. Multi-Frequency alarms operate by emitting sound at multiple frequencies attenuated above 4000Hz.

Sold by Virgo Fleet Supplies, Brooklyn NY. Ships nationwide. Call 800-270-6003 or order at virgofleet.com.
Source: https://virgofleet.com/product/multi-frequency-white-noice-back-up-alarms/