1. No power supply required - This meter is made in a vintage style. Compared with electronic meters, OUR doesn't need any power supply. It is cost - effective as there is no additional cost, and there is no risk of the battery running out and the meter stopping working. It will serve successfully for many seasons. 2. Rubber pad - The handle for handlebar installation has a rubber pad to prevent damage to the handlebar. There is no risk of scratching the bicycle when riding on uneven roads. The bracket is tightened with screws, so it is suitable for any bicycle model. 3. Simple operating principle - The meter is driven by a cable, commonly known as a worm, which is connected to the front hub - shock absorber behind the front fork. The end of the worm is connected to the spoke. When the wheel rotates, the worm gear starts to rotate the cable and makes the mechanism work. The speedometer shows a maximum speed of 60 km/h, as well as the rotational speed and the total kilometers traveled. 4. Waterproofness - During a journey, we may encounter various weather conditions, but this is not a problem for real cyclists. Therefore, it is very important that the meter is waterproof and the influence of weather conditions will not affect its function. 5. Specifications - Material: Aluminum - Waterproof: Yes - Dimensions (length/width/height): 98/12/8 cm - Cable length: 86 cm - Set weight: 0.35 kg - Weight with packaging: 0.36 kg 6. Inside the package - Meter - Cable - Wheel size numbers: - 26 inches - 27.5 inches - 28 inches - 29 inches