Many uses such as, door ajar warning, bus driver alert, low air pressure, temperature, etc. Works with any temperature, pressure, door or momentary switch. Product Features:12V DCElectrical contacts are designed for instant response and uninterrupted signalImpact-resistant ABS resin caseMoisture-repellent insulatorTwo screw terminals with lockwashersSize: 1 7/32L x 2 1/2W x 2 17/32H (30.9 x 63.2 x 64.3mm)Replaces: Ford FDM-2938-A, GMC 1116882, Superior Coach 76032, Divco-Wayne E-11811-A
