Bose has been testing its environmental speakers for over a decade. The outdoor speakers are tested against rain, salt, snow and temperature extremes of 70ºC to -40ºC. Bose even puts them through a rigorous 1,200 hours of salt-fog testing, which is twice that of the demanding Marine Industry Standard. One thing’s for certain: these weather resistant outdoor speakers can stand up to some of nature's worst conditions - and they come with a five-year limited warranty. Bose® 151 outdoor stereo speakers come with adjustable, weather-resistant brackets, so you can mount them however you fancy (horizontally or vertically).