CatEye Compact Safety Light Bicycle Rear Safety Light SL-LD100-R Compact design features two on-chip LEDs with three settings:flashing, constant or alternating modes Simply touch the marked area on the switch to the marked area on the light and turn the light on/off or choose one of three settings Flashing-Up To 100hr; ; Constant-Up To 50hr Allternating-Up To 150hr