The Primary objectives are to asses the safety and the physical performance of the SenseUrine’s sensor unit and to validate the concept of determining bladder volume by measuring heat flow. The Secondary objective is to optimize the device accuracy Primary endpoints: To show that the sensor has no negative effect on the subject, to determine bladder urine volume, based on the sensor’s signals, in an accuracy of ±10% compared to the actual volume. Secondary endpoint – to determine bladder urine volume, in an accuracy of ±10%, in different ambient conditions (temperature and clothing).