Vesper External Weatherproof Single Speaker f/Cortex M1External Weatherproof Single Speaker for Cortex M1 Vespers External Weatherproof Speaker is designed for the marine environment. With IP66 ingress protection, they are suitable for mounting almost anywhere onboard. Compact in size, this speaker features heavy duty molded plastic housing. Features: 3 70 Watt Speaker Frequency response of 80Hz 18Khz 4 Ohms impedance UV resistant polymer housing IP66 water resistant for marine applications Polypropylene