Abstract: The invention relates to an instant fastening system for fastening a portable electronic device to an object, the instant fastening system comprising: an instant socket, which comprises at least one fastening element for fastening the instant socket to the object; a connecting structure for connecting the portable electronic device to the instant socket, the connecting structure comprising connecting elements that radially extend from the connecting structure, the instant socket further comprising a positioning housing for positioning the connecting structure to the instant socket, the circumference of the positioning housing comprising radial positioning grooves for locking the connecting elements when rotating the connecting structure in the positioning housing, from which positioning grooves at least two positioning grooves are located on the same side of the circumference of the positioning housing, thus allowing to position the connecting structure to the instant socket in at least two positions differin

Abstract: The invention relates to a peripheral device of a user-specific performance monitor, a user-specific performance monitor, and a method for changing the state of a peripheral device of a user-specific performance monitor. The peripheral device is configured to produce performance information characterizing the user's performance and transmit performance information wirelessly to a main unit of the user-specific performance monitor. The method comprises receiving a signal wirelessly in the peripheral device; determining the signal level of the signal; comparing the signal level with a threshold value; and changing the state of the peripheral device between standby and operating states after the signal level has reached the threshold value.

Abstract: The invention relates to an instant fastening system for fastening a portable electronic device to an object, the instant fastening system comprising: an instant socket, which comprises at least one fastening element for fastening the instant socket to the object; a connecting structure for connecting the portable electronic device to the instant socket, the connecting structure comprising connecting elements that radially extend from the connecting structure, the instant socket further comprising a positioning housing for positioning the connecting structure to the instant socket, the circumference of the positioning housing comprising radial positioning grooves for locking the connecting elements when rotating the connecting structure in the positioning housing, from which positioning grooves at least two positioning grooves are located on the same side of the circumference of the positioning housing, thus allowing to position the connecting structure to the instant socket in at least two positions differin