Visaton 2907 k 57 c round waterproof speaker 8 ohm visaton 2907 p a waterproof 5 7cm 2 2in miniature speaker from visaton with transparent mylar membrane and neodymmagnet ip protected on front side when built into a sealed enclosure making it suitable for outside and harsh environments p visaton 2907 k 57 c round waterproof speaker 8 ohm