Specifications: This product is multi-functional, which can be served as a watch and a headset cap for your bike. It adopts a integrated design, which consists of aluminum alloy cap and electronic watch. The great bicycle accessory is waterproof and dustproof, and is powered by button battery. With luminous function, compact body, shockproof effect, this novel watch makes your bicycle look more fashionable and more grade after easy installation. There are 2 colors optional, and you can choose the best one to match with your bicycle. Item Name: Bike Clock Material: Aluminium Alloy Model: FS181230 Accuracy: 24+-0.1 Seconds Features: Mini Size, Waterproof, Easy to Install Size: 2.1cm x 3.7cm/0.83" x 0.79" (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 Bike Clock (Battery Included)