LED illumination cycle light; Simply attach it to the wheel and press the switch. The LED illumination changes in multiple colors. Product Specifications: Length: Approx. 85.3 inches (215 cm), Illumination Part: Approx. 6.3 inches (16 cm), Clip to Tip: Approx. 7.9 inches (20 cm), Battery Box (Clip Portion) Approx. 1.6 inches (4 cm) x 1.3 inches (3.3 cm), Color: Black, Material: Plastic, ABS, etc., Batteries Used: CR2 x CR2 (test batteries included.