I-reverse Commercial Sweeper Sound Reverse-backup Alarm. OSHA approved 107 Db. 12v-80v White Noise-Directional, Not Beep-Beep 112dB. Industrial Backing Alarm, Reverse Alarm, Back-Up Alarm, multi tone reverse alarm, multi sound back up alarm Reverse Warning Device, Commercial vehicle back-up alarm OSHA approved swishing sound safer reverse alarm, bbs-tek 112db alarm back up alarm