Star Halo® Technology is patented (#8, 662, 702) 12 different selectable flash patterns in either of two phases, plus steady-on Two versions to choose from 4 high intensity LEDs, and 8 Ultra high intensity LEDs Exceeds SAE Class I J845 standards California Title 13 available (with clear dust cover 255H8TAL) S-Link System™ synchronizing capabilities with other Star LED units Fully encapsulated circuitry for weather and shock resistance Extremely low current draw Durable polycarbonate, twist onoff lens Lightweight ploycarbonate base, flange three-hole permanent mount, flange two-hole permanent mount, 1" pipe mount, magnet mount, and vacuum magnet mount with cig. plug (onoff and pattern select switch)