Featuresr 14 leds single sided with 3 colors white blue and greenr light with 40 different gorgeous patterns and 5 groups of words shining by turns and changing every 2 secondsr pattern is clear and complete when speed is up to 15kmhr equipped with magnet sensor flash continuously in the actionr automatic and manual power on and automatic power offr powered by three aaa batteries not includedr easy installationr r note the bike wheel spoke light can be used in rain but can not