Lectrosonics DSSM-A1B1 Quick Start Manual page 2

What is IP57?
IP ratings indicate how resistant an electrical
device is to water and common materials - like dirt,
dust and sand.
The DSSM's IP57 rating indicates that that it is
water resistant up to 1 meter (3.2 feet) for 30
minutes - perfect for your most demanding
environments.
2 LECTROSONICS, INC.