The T-770A is a waterproof projection speaker built-in 70v/100v transformer. The 70v/100v transformer technique reduces line losses on longer distance and allows easy parallel connection of multiple loudspeakers. The built-in 5-inch full range speaker driver is designed of wide frequency response 130 to 15kHz, the multiple power taps 3W, 6W and 10W are helpful for different applications varies from room size and ambient noise surroundings. The aluminum enclosure and metal bracket are of white color. Easy and secure wall mount installation through the supplied mounting bracket. It is ideal choice for industrial and commercial applications in the outdoor area of train station, shopping mall, parking area and factory where background music and paging is needed.