OUTLEYNY Bike spoke lights are great bicycle safety warning decoration for kids and adults. No speed requirement any more! Work with 3pcs AAA 1.5V battery (not included). Amazing bike lights increase visibility from all directions to ensure your safety. IP67 waterproof lights make your bike wheels visible in rainy or snowy days. How to Mount(Just 5 minutes or less): 1) Place the battery container mount to your wheel hub, tighten both of the zip ties. 2) Twist the LED cable around one spoke toward the inner rim of the wheel . 3) Wrap lights around every second spoke once. If the LED cable is too long, you can wrap it twice around. Product Specification: LED Quantity: 20 pieces. Led light strip length: 2.2 meters. Two Modes: steady and flashing models. Waterproof: IP67. Power: 3*AAA Batteries(NOT INCLUDED). Note: not fit for wide spokes bike.