Specifications: No need to modify the wires, it can be mounted directly on the steel wire of the wheel. Good performance. Switch design, with 3 lighting modes (normally on, flashing, fast flashing). Item Name: Bicycle Spokes Light Material: EVA + Plastic Power Supply: 1 x 2032 Battery (Included) Features: Easy to Install, Bicycle Accessory, Waterproof Size: 13cm x 3.7cm x 2.5cm/5.12" x 1.46" x 0.98" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bicycle Spokes Light