Patent ID: 8737650

Claim:
A system comprising a portable electronic device and an auxiliary device, the portable electronic device and the auxiliary device each comprising an interface allowing the establishment of a communication link between them, at least to be able to transmit data representative of a status information from the auxiliary device to the portable electronic device, wherein the portable electronic device comprises a timing unit for determining a time interval and a memory for storing data, wherein a reference start time is stored, and the portable electronic device is further adapted for monitoring and storing an operating time from a power-on-time to a power-off-time of operation of the portable electronic device, and wherein the auxiliary device comprises a master timing unit for providing a signal representative of the present time, and wherein the system is adapted to transfer said signal representative of the present time from the auxiliary device to the portable electronic device and to store it in said memory when the portable electronic device is connected to the auxiliary device or at the request of a user, whereby the daily use and non-use pattern of the portable electronic device can be estimated the portable electronic device including a measure of the absolute time elapsed from said reference start time.