Waterproof, 14 Blue LED lights. Install on the front wheel or Back wheel. 36 design patterns and 5 word patterns. Install 3 AAA batteries per diagrams ( 3 AAA batteries not include ). Install Bike Spoke Light unit on front wheel on any spoke with the LED's facing either the left or right side of bike. Install the sensor unit on the fork of the front wheel, Make certain the sensor is aimed at the target point on the Bike Spoke Light ( as is diagram ) but does not touch it. If you installed the unit facing the left side of your Bike, the letters will be backwards to change the letters hole the ON button down for 5 seconds until you see all the LED's turn Blue, The letters will now be correct. Press gray button to turn ''ON''. When riding slowly , the LED will blink and will only show a pattern of lines. The LED lights will keep blinking for 2 minutes after the wheel has stopped. The final light will turn off completely in approximately 3 minutes after the wheel has stopped.