Visaton k 20 40 oval mini speaker waterproof visaton k 20 40 8 ohm p the visaton k 20 40 is a compact size rectangular miniature speaker it is suitable for signal output in machines and other equipment where space is at a premium p p typical applications include voice and signal output in machines and other equipment both indoors and outdoors p visaton k 20 40 8 ohm oval mini speaker waterproof