Sphygmomanometer fast and accurate. Brassard comfortable. Storage Beware however. We must put it in a sense that no object is press one button: off otherwise the product starts. Indeed in the words of another user, use the buttons to change the user before taking the voltage is not very user friendly. Pressing ON / OFF automatically triggers the tension on the last user without possibility of change. To switch users, you must again press ON / OFF to stop the voltage tap and press the "set", then press + or - to select the user (1-4). Off again by pressing ON / OFF. Finally turn on again by pressing ON / OFF. The pressure measurement starts immediately and the selected user.