This is a SAE Class 1, low dome, Whelen L21 Series Super-LED beacon that is fully encapsulated for resistance against moisture, vibration and corrosion. The hard-coated dome provides extra protection against environmental damage. This light is rated for thousands of hours of reliable use. This cord with the cigar plug also has an On/Off switch and a pattern control selection switch. The magnetic mounting models do NOT include cruise light, low power, or SYNC functions. This light is covered under a 5-year warranty. 12 VDCAvailable in High or Low domesRated for thousands of hours useSmartLED beacon designPolycarbonate baseCompatible with #MIRROR20 Mirror Mount BracketPermanent mount features 25 Scan-Lock alternating and simultaneous flash patterns, including steady burnPermanent mount has additional mounting options of 1″ pipe mount, permanent mount, or J-hook mountPermanent mount beacons are supplied with a 6″ pigtailMagnetic mount: 75 Signal Alert flashes per minute standard, 25 Scan- Lock flash patterns to choose fromMagnetic mounts are supplied with 10′ straight cord and cigar plug with LED “ON” indicator On/Off switch and pattern control selection switchMagnetic mounts are 12 VDC Only80 lb. magnetic mounting baseMagnetic and magnetic/suction mount models do not include cruise light, low power or SYNC functionsFully encapsulated for moisture, vibration and corrosion resistanceAvailable in combination, magnetic, and magnetic/suction mountsHard-coated lenses minimize environmental damage from sand, sun, salt, and road chemicalsVirtually no RFI/EMI radiationFive year warranty