Attached the inflating pump to the valve of your tire. * It"s could use for a Schrader valve when you use it directly. * If you unscrew the plastic cap of the nozzle, then overturn the rubber inside, it will become a Presta valve using one. * Pump the handle up and down to fill the tube with air * The latest design: You could installed to the water bottle holder directly. Another accessories could take down easily. If you don"t like to hold it on your bike just put in in bag would be fine.