[. . . ] [. . . ] Inserting battery First insert the battery provided into the battery compartment at the back of the Speedbox, using a coin to open the bat4 Close the battery compartment again carefully. Fitting the Speedbox Secure the back of the Speedbox to your shoe by pulling the shoelace through the hole provided. Then you have to put the front opening of the Speedbox between the shoelaces. Setting up data transmission Before using for the first time, digital data transmission between the Speedbox and the heart rate monitor have to be coordinated ("paired"). [. . . ] [. . . ]