Description The bike speedometer is a cycling equipment accessory. When it is installed, it will make you safer and more secure during riding. You can control your riding at all times and let you have a better riding. A perfect gift for your bike lover friend. Features -Color: Black, Red -Material: ABS -Size: 4.50X4.50X2.00cm/1.77X1.77X0.79in -Note: Powered by button battery(Included) – Suitable for bikes and electric bike, it is also convenient to carry with your side. – Waterproof design, thus you can use it confidently even in a rainy day, and it will not be damaged by the rain. – Perfect for leisure cycling, competitive competition and more, measuring their time. – Secure and convenient speedometer for easy installation, bringing much convenience for you. – Manufactured with premium material that can be used for a long term use. Features: Waterproof Assembled Product Dimensions (L x W x H): 1.77 x 1.77 x 1.77 Inches