【Powerful Features】Want to know how fast you are? It's called a bike computer because it can do so much: calories burned, distance, miles traveled, average speed and more. The speedometer has 2 buttons, the right button is ""mode"" which means find the mode (or parameter) you want, and the left side is ""set"" which means confirm the mode. 【Excellent Product Performance】bike speedometer has 19 functions. Give you a better driving experience. It automatically goes into sleep mode after 5 minutes of inactivity, and when you press any button or drive, it displays your recent driving stats. IP65 waterproof protection, can work normally in rainy days. (Do not put in water directly) 【Touch Backlight】The bicycle speedometer has a glowing screen in the dark to help you read the bicycle computer better. Manually touch the Mode button and the Set button at the same time. You can leave the backlight on all the time. Touch again simultaneously to deactivate this mode. The anti-glare backlit display uses premium technology for good visibility in direct sunlight. 【Installation Requirements】1. The distance between the sensor and the host is less than 50cm, the host can receive the signal and operate, the closer the better. (The computer sometimes shows fluctuating data with a distance of more than 50cm, which does not affect all data.) 2. The distance between the magnet and the sensor should be about 5mm, the longer it is closer, the better. 3. The magnet faces the back of the sensor battery 【Extension Bracket】bike computer comes with a universal bracket and an extension bracket. Extension brackets are only available for handlebar diameters from 22.2 to 31.8. The mount expands your field of vision while riding, and the bike's speedometer reduces the need to look at the monitor, reducing strain on my shoulders and neck while making my ride more comfortable.