Featuresr 32 leds with three colors blue green and redr light with 18 gorgeous and cool flower patterns changing very 3 secondsr special program for excellent visual impact at both high and low speedr built in sensor no need of additional installation of sensorr specially designed accessories for firmly fixing on the hub of biker auto sleep state after wheels stop turning for 6 secondsr powered by three aaa batteries not includedr water proof design can be used in rainr r note