XuanWheel X1 Bike Wheel Light Bicycle Colorful Wheel Spoke Light Fit 26 inches And Above Bike Wheel XuanWheel, a PROGRAMMABLE bicycle light that can turn your bicycle wheel into a colorful screen. The light shines both sides, and is controlled via APP. Search xuanwheel APP in google play or apple store, then download a galaxy of pictures! Also, you can upload your own pictures, video, GIFs, DIY your own text---Never be fixed to pre-stored pics any more! The only limitation is your imagination. Click the button on APP to shift from front wheel to back wheel, you can have A PAIR of spokes lighting your bike simultaneously. The APP monitors your riding speed, maximum speed and records your journey time and mileage. Just leave these mess calculations to XuanWheel, and be a happy, free night rider. It consists of 192 ultra-bright RGB LEDs, which is much more than normal spokes, and this ensures bright, clear, and vivid display effect.1800 mah built-in rechargeable battery, keeping power on for 6-16 hours when fully charged. Easy mounting, and waterproof in all weather conditions. It displays clearest image in a speed of 8km/h-60km/h, no problem even when you are riding slowly. Fits 26 inches bike wheel and above sizes. Both android and ios system applicable. Installation tutorial available. Most importantly, price reasonable and affordable. Search rGYnwea7KQs on Youtube for installation tutorial. Note: Support Bluetooth 4.0, support Android 4.3 and above, iPhone 4S and above system. This unit only has ONE spoke light inside FOR ONE WHEEL.