• Natural method of contraception
• Hormone-free
• Involves no drugs and is easy to use
• Designed to be 94% reliable (see below)
• No side effects
• Set consists of a touch screen monitor and simple urine tests
• Persona monitors changes in two key fertility hormones, estrogen and luteinising, to identify the days when one has low chances of becoming pregnant (green days) and the days when the chances are higher (red days)
• During the first cycle of use one will be asked to test for 16 days
• After the first cycle, one will be asked to do a test for 8 days each cycle

Reliable if one follows the instructions properly and use it as the only method of contraception. This means that if 100 women use Persona for one year, we expect 6 may become pregnant because they have had an intercourse on a day when Persona incorrectly showed they were not at risk of becoming pregnant (green day).