The T-720B is a waterproof horn 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 horn speaker driver is designed of wide frequency response 250-8kHz, the multiple power taps 7.5W & 15W are helpful for different applications varies from room size and ambient noise surroundings. It is ideal choice for industrial and commercial applications in the outdoor area of parking, park, garden, corridor and playground where paging is needed.