Importantly, this little speaker is also IP67 certified, which is a pretty serious dust and water ingress rating. The 6 means it's totally dust-proof, so you can throw it around on the beach without worry of sand getting into the important bits, and the 7 means it can be fully immersed in water without causing any damage. Our reviewer even tested it in the shower with no issues, and clipped it to his belt while doing yard work, and the JBL never missed a beat.