Heavy duty Preco back-up Alarm, auto volume adjustment: 97 thru 112 decibles, 12-24v DC, mounts on 2″x4-1/8″ centers 2 year warranty, Our most popular line of self-adjusting alarms automatically adjust to 10 decibels above the surrounding noise, thus reducing noise pollution and irritation for operators, and workers. Versatile and compact universal mounting. These alarms have #8-32 UNC terminals studs. Used by major OEMs. – 97-112 db (Self Adjusting) – 12-24 Volts DC – Terminal Studs – SAE Type A – C – Weight: 1 lb. 8 oz. (681g)