The unit, with the cap fastened securely, has a waterproof specification of IPX7*1 as specified in “Degree of protection against water immersion” of the IEC60529 “Ingress Protection Rating (IP Code)”, and a dust proof specification of IP6X*2 as specified in “Degrees of protection against solid foreign objects”.*1 IPX7 equivalency: The speaker has been tested to and maintains its operability when gently submersed in water to a depth of 1m and left for 30 minutes.*2 IP6X equivalency: The speaker has been tested to and continues to block dust after stirring for 8 hours in a testing device which contains dust particles that are up to 75 μm in diameter.