2 PACK BIKE WHEEL LIGHTS: LED bike wheel light string has high flexibility, can be moderately bent, make any shape you like. They designed for cycling decoration and safe riding. Each light is powered by 3*AA batteries (batteries not included) HIGH BRIGHTNESS LED: The bike wheel light consists of 20pcs bright LED lights, which makes your wheel visible and stand out from all angles for night riding. TWO MODES: Steady on and flash. Press the power button to change modes. EASY TO INSTALL: Bike spoke lights fit for most bicycles with standard spokes. Easy installation and removal. Place the battery into the battery case, then fix the battery case on the wheel wire with screws, finally wrap the LED light string on the wheel wire. WATERPROOF: This bike tire lights is made of high quality material and waterproof design as a whole, no worry about the bicycle tire light will be damaged in rainy riding. But please dont soak these bike tire lights in water.