Abstract: A system that monitors user activity includes a wrist device including a curved body and an electronic circuitry supported by the body. The electronic circuitry includes a first set of light emitting diodes arranged in a matrix form and forming a display unit, at least one motion sensor configured to measure physical motion caused by a user to the wrist device, and at least one processor configured to acquire motion measurement data from the at least one motion sensor, to process the motion measurement data into a motion activity metric, and to cause the display unit to display the motion activity metric. The at least one processor is further configured to acquire heart activity measurement data from a heart activity sensor, to process the heart activity measurement data into a heart activity metric, and to cause the display unit to display the heart activity metric.

Abstract: A portable physical activity monitor device includes a power source for providing power to the physical activity monitor device, at least one processor and at least one memory including a computer program code. The at least one memory and the computer program code are configured, with the at least one processor, to cause the physical activity monitor device to perform operations including acquiring an indication of a physical activity metric of a person carrying the physical activity monitor device. The physical activity monitor device includes at least one electrochromic part including bi-stable electrochromic material, and the physical activity monitor device is caused to control an optical characteristic.

Abstract: A system that monitors user activity includes a wrist device including a curved body and an electronic circuitry supported by the body. The electronic circuitry includes a first set of light emitting diodes arranged in a matrix form and forming a display unit, at least one motion sensor configured to measure physical motion caused by a user to the wrist device, and at least one processor configured to acquire motion measurement data from the at least one motion sensor, to process the motion measurement data into a motion activity metric, and to cause the display unit to display the motion activity metric. The at least one processor is further configured to acquire heart activity measurement data from a heart activity sensor, to process the heart activity measurement data into a heart activity metric, and to cause the display unit to display the heart activity metric.