The DSP255II is a weatherproof outdoor column speaker with a 70v/100v transformer built-in. The 70v/100v transmission is realized in a high-voltage, low-current mode, which makes longer distance transmission and parallel connection of multiple loudspeakers possible. The net cover is made of aluminum and would not rust, it is also designed of a weatherproof and heavy damage-proof finish; long-term durability, high sensitivity, and clear and sonorous sound. Easy and secure wall mount installation in the outdoor area through the supplied pair of metal mounting brackets. This column speaker is an ideal choice for industrial and commercial applications in the outdoor areas of train stations, shopping malls, parking areas and factories where background music and paging is needed.