There are two ways to stop the measurement. One is to tap the button to start and tap it again to stop. The other is to start when the button is tapped and stop when the button is released. Choose the one that is easier to use. ● Distance setting and units Tap the distance to change it. The default setting is 18.44 meters. The unit of distance can be selected from "meters" and "feet" on the setting screen. ● Speed Unit The unit of speed can be selected from “KPH” and “MPH". If you want to change it, do so on the setting screen.