Star Halo Technology is patented (#8, 662, 702)12 different selectable flash patterns in either of two phases, plus steady-onTwo versions to choose from 4 high intensity LEDs, and 8 Ultra high intensity LEDs Exceeds SAE Class I J845 standardsCalifornia Title 13 available (with clear dust cover 255H8TAL)S-Link System synchronizing capabilities with other Star LED unitsFully encapsulated circuitry for weather and shock resistanceExtremely low current drawDurable polycarbonate, twist onoff lensLightweight 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)