Powerful FeaturesYou 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 Performancebicycle 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 while driving, it displays your recent driving stats. IP65 waterproof protection, can work normally in rainy days. (Do not put into water directly) Touch Backlight The bicycle speedometer has a luminous 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 at the same time to deactivate this mode. The anti-glare backlit display uses premium technology for good visibility in direct sunlight. Installation Requirements1. 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 displays fluctuating data with a distance of more than 50 cm, which does not affect all data.) 2. The distance between the magnet and the sensor should be around 5mm, the closer the better. 3. The magnet faces the rear of the sensor battery Extension BracketThe bike computer comes with a universal bracket and an extension bracket. Extension brackets are only available for handlebar diameters 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. Caution:Not suitable for children under 10 months. Caution:Do not use near power lines or during a thunderstorm. Caution:Risk of choking or suffocation with broken or uninflated balloons, keep out of reach of children.