Bose 151 SE Elegant Outdoor Speakers (White) (34104) 2-1/2 full-range, glass-filled speaker cone delivers reliable. Suitable for use as boat speakers Glass-filled polypropylene cabinet provides added yearlong protection against weather extremes. Withstands humidity and fog. Mount horizontally or vertically with included brackets/hardware Adjustable weather-resistant brackets provide secure installation to most surfaces. Slot-port tuning reduces air turbulence for cleaner and deeper reproduction of music's lower notes. For the boaters, we even put them through 1,200 hours of salt-fog testing Engineered and tested to withstand snow, rain, salt and temperature extremes of -40 degree F (-40 degree C) to 158 degree F (70 degree C) Note-keep the speakers at least 9 inches from any video screen or monitor. Bose 151 se speakers are not magnetically shielded. Bass or treble is weak check the tonal balance setting on your receiver or amplifier. Compatible with amplifiers or receivers rated 10 to 100 watts per channel at 4 to 8 ohms. Features speaker cord measure length and choose wire gauge to install