The contraceptive ring is a small, soft, silicone ring that contains both oestrogen and progesterone. A new ring is inserted into the vagina every month. It remains in place for 21 days during which the hormones are released slowly into your bloodstream through the vaginal wall, and then it is removed.
You have a 4 day break and then you repeat this cycle again. As it is very small and usually not felt, it does not interfere with sexual activity.
Here is some important information on the vaginal ring.