Bertil has a few different functions, partly as an aid to maintaining an erection and partly as a couple toy. If you have difficulty maintaining an erection long enough or want a fuller erection, Bertil's pleasantly squeezing ring helps to keep the blood in the penis swelling bodies. Bertil is also a perfect toy for the couple. The small ball on the ring vibrates against the clitoris and gives extra stimulation to the woman while the man is stimulated by the vibrations propagating down around the penis. When inserting the batteries in your Bertil, it is important that you leave the piece of paper in the battery compartment. The batteries that come with it are test batteries and are estimated to last about 20-40 minutes. First, put the ring on the root of your erect penis. Feel comfortable. Now you can start the vibrator and feel how it vibrates around both the base of the penis and down to the scrotum. The small ball is mainly to stimulate her clitoris, but can also be turned towards the scrotum. Some men also use penis rings because it gives a more comfortable feeling in the glans. The guideline value for using Bertil is a maximum of 30 minutes. The blood in the penis is needed not only for erection, but also for oxygenation. Should you feel discomfort in the penis during use, the ring should be removed so that the blood can circulate freely again. Anyone who has difficulty getting blood out of the penis, ie getting an erection, may also need a penis pump to pump blood to the swollen bodies.