Multifunction - The LCD screen is highly portable. It is light in weight and moderate in size, and the color of the screen can be adjusted and changed according to your needs (red/green/blue). It records all the data you may need, such as speed, distance and riding time, temperature, etc. The multifunctional performance of this product satisfies your sports needs well. Waterproof And Drop Resistant - Our speedometer is made of high-quality materials. And we use an advanced chip that allows you to collect data wirelessly during exercise. This bicycle speedometer is protected by a rubber ring and a sealed case protector, which improves the drop resistance and water resistance. Automatic Sleep And Wake - The screen will automatically enter sleep mode after five minutes of no input signal. The bicycle computer will also be automatically awakened when it feels shaking or receives an input signal and presses any button. Therefore, power consumption can be saved to a large extent. And this bicycle computer system is easy to operate, you can easily set the data according to your needs. EASY TO USE - It is easy to install, it is wireless and has no complicated wires, and it only takes a few steps to complete the installation. Before installation, please read our manual for some necessary information. Note: When installing the magnet, please do not directly correspond to the antenna cap. Colour: Black Size: Diameter 52MM Package Include: 1 X Speedmeter 1 X Buckle 1 X Sensor Kit 4 X Strips 1 X Holder 1 X Extension Bracket 1 X Instructions