Multi-voltage input 12 - 24 VDC, Low power function for night time use, Non-volatile memory recalls last ash pattern used at power up. 23 user selectable ash patterns, Multiple units can be synchronized, Reverse polarity protection. Weatherproof and vibration resistant design for external use, Available in permanent and vacuum magnet mount. 24 LEDs. SAE J845 Class 1, California Title 13, ECE R10, 5 year warranty.