Suitable for installation on 99% types of bicycle use( install pipe diameter should be 20MM -30mm)Cool sky stars lighting mode makes you stand out in the crowd7 Kinds of switch: A:9 LED Steady light ，B:9 lights all bright fast flash C:9 lights all bright flash slowly，D:9 lights flash Slowly from left to right (1-2-3-4-5-6-7-8-9)，E:9 lights flash Slowly from right to left (9-8-7-6-5-4-3-2-1)，F:9 lights Flash fast from left to right(1-2-3-4-5-6-7-8-9)，G:Slow flash cycle(19-28-3-47-56)Easy to install in bicycle frame without tools5 high bright Led light， constant laser light for safety