Select the desired tire pressure - the integrated memory function automatically takes over the last set value. Press start and place the battery bicycle pump on the valve. The digital display will show the current pressure in either Bar or PSI. Once the target value is reached, the pumping process stops automatically and you can continue riding with fully inflated tires. A single battery charge is sufficient for three tire fillings, ensuring you won’t run out of air while on the go. With the included USB cable, the electric mini pump can be recharged in about 25 minutes.