IP67 Waterproof Micro Speakers CUI Devices low-profile CMS series of waterproof micro speakers is designed specifically for applications with small diameter requirements that deal with moisture and environmental contaminants. Featuring an Ingress Protection (IP) rating of IP67, the speakers offer nominal inputs of 0.7W, sound pressure levels (SPLs) ranging from 90dB to 96dB at 0.1m, and resonance frequencies from 550Hz to 800Hz. Three mounting methods are available, including spring contacts, solder pads, and wire leads.