XIANQI 16 functions Bike computer LCD with green backlight allows you to read the digitally slightly distant, dark night or in the long tunnel. 16 functions compare speed record, average, maximum, relative, time riding, record consumed, Stopwatch and so on. Wireless and Waterproof Design Waterproof design makes it more durable. The outline of the cycle computer is simple and cool, what's more with the waterproof design, it will always be fashionable and new. Convenient operation Convenient and quick to record the speed and kilometers without delay. Just one touch when you ride again, take up this bike computer and start your cycling time straight away. Notes This wireless bike computer has an automatic switch-on function by means of a built-in scroll switch in the computer, so that there is a sound. This is not a product defect, but a normal phenomenon. 16 functions Bike computer LCD with green backlight allows you to read the digitally slightly distant, dark night or in the long tunnel. 16 Features compare speed record, average, maximum, relative, time riding, record consumed, stopwatch and so on. Waterproof protection Brief immersion in water, light rain or moderate rain without problems It will however not recommended to stay in the rain long to avoid water failure. Turn the coin to the left to open the battery cover, replace the battery with a n eue (not included), cover the battery case and turn it to the right to tighten it Delivery Quantity: 1 Piece Product color: black Product size: 4.6*4.6*1.9cm