The shipping took a while because Importprodkt. A star deduction there because of the lack of German manual. Through the side openings and the backflow opening of the ear canal is perfectly rinsed and can be also nice to build pressure, without the fear of injuring the eardrum. The blue tip can unscrew it, it is quite soft and flexible. I do not know how often they survived the ups and downs. Here I would have liked a replacement piece to change.
