Luminous with high-grade high-brightness cold light source * 12/24 hour clock, Celsius / Fahrenheit temperature selection, calendar * High brightness in night, average and soft light source, have wide influence in the professional bike team. * Odometer head can be rotated, easy to install to horizontal or vertical hand bar. * Suitable: bicycles, electric bike, motorcycles. Suitable bicycle wheel diameter: 10.00-99.99CM (4 to 40 inch)