Quieter, yet safer. White Sound® reverse alarms create an “ssh-ssh” sound which is gentle on the ear and dissipates quickly, meaning the alarm can only be heard in the danger zone. The safety benefits of white sound are the same whether off-or-on-road. However, in urban areas, the environmental impact becomes much more important. White sound meets the challenge by dissipating quickly outside the hazard zone, eliminating noise complaints. Furthermore, with its wide frequency range, white sound alarms can even operate 5-decibels quieter than a tonal alarm, yet still provide the same alerting effect.