i-Reverse Commercial Sweeper Sound Reverse-Backup Alarm. OSHA approved 97 db. 12v-80v White Sound Directional Alarm, Not Beep-Beep Tone. Backing Alarm, Reverse Alarm, Commercial Back-Up Alarm Reverse Warning Device, multi tone alarm, multi sound reverse alarm OSHA approved-swishing sound safer reverse alarm, bbs-tek https://youtu.be/044hKqVTs_o