A mobile monitoring device (MMD) for monitoring physical characteristics of a subject, including a casing an attaching mechanism for releasably attaching the MMD to a garment worn by the subject a control unit enabling to control and execute operations of the MMD and identify breathing related alarming situations a sensor element enabling to sense breathing related characteristics of the subject by converting physical vibrations into electric signals an alarm output device for enabling to operate at least one alarm in case alarm breathing related situation is identified and an arm extending from the casing. The arm allows abutting the body of the subject at a first proximal end thereof and the sensor element at a second distal end thereof when the device is worn by the subject, thereby allows mechanically transmitting physical movements thereof caused by movements of the subject body to the sensor element thereby mechanically leveraging the movement.
