The BP unit is not set up to be used by two people. The memory in some of Microlife’s units is set up for two users. In the 3AC1-PC units the memory design inside the monitor is set up for only one person. But, from talking to other consumers who have purchased the unit this is how they have been handling it when using it for two users. The first person takes their measurements and then downloads the reading immediately to the software under their profile. The next person, just creates a separate profile, uses the unit and then downloads the data to their profile. The software can be set to erase the data in the monitors memory after each download, in the settings section, middle circle button in the very bottom section of the software, this opens the settings box. Just make sure the erase measurement after readings circle is colored in like below. This would prevent data from one person from being downloaded by accident to the other person’s profile.