PureAire Monitoring Systems 24VDC Horn & Strobe, Blue, Certifications/Compliance: CE Compliant, Diameter Inside: 3.66 in., Dimensions: 7 in. x 7 in. x 7 in., Height: 17.8 cm, Length: 17.8 cm, Heavy Duty ABS, Temperature Range: 14 deg.F to 131 deg.F, -10 d