Patent ID: 7717866

Claim:
A portable device comprising: a housing; a display; a storage medium; at least one acceleration sensor; and means arranged for calculating an activity parameter based on a signal generated by the at least one acceleration sensor, storing the calculated parameter in the storage medium, and showing the same in the display, wherein said parameter is the Physical Activity Index (PAI) or a derivative thereof, which is solely calculated by multiplying an average of the absolute values of a signal or samples of a signal of the at least one acceleration sensor with at least one constant, which at least one constant is independent of personal data of a user of the portable device, whereby the at least one constant is a universal metric that is not related to age, weight, or gender, the portable device being immediately operable after being powered ON such that the user that uses the portable device is not required to calibrate the portable device nor input his personal data to allow the portable device to accurately function.