The CO-8WL (low sensitivity) and CO-8WLh (high sensitivity) Waterproof Lavalier Microphone has a low-profile of merely 4mm in diameter, but it embodies all the high performance characteristics you might expect from a larger format microphone. Miniature Lavalier at Only 4mm! The sign of a good miniature lavalier microphone is no sign at all! Small and discreet, their low-profile nature is what broadcasters and performers love the most. Gently tucked behind a button or hidden in a hairline, miniature lavalier microphones are the most unobtrusive technology on stage or on camera. IP 57 Waterproof Rated. Behind a button, or hiding in the hairline, this lavalier microphone is ideal for applications requiring complete camouflaging. Of particular note is that the CO-8WL lavalier mic is IP 57 waterproof rated against water, sweat and makeup—conditions that are commonly harmful to microphones. This little lavalier delivers big results currently on Broadway and off-Broadway productions including Hamilton, Ain't Too Proud, Hairspray, Hello Dolly! and more!