This DSP170A is widely used in schools, gymnasiums, square venues, parks, parking lots, railway stations, airports, villas, shopping malls, and other places, and is the ideal choice for public broadcasting. In order to facilitate your installation, commissioning, and use of this product, please read this manual before installation. The product is an active horn speaker developed for security and protection linkage, with a simple arc design style, beautiful appearance, adjustable bracket installation, and ease of installation and removal. With durable ABS plastics for the case, it can be used outdoors for a long time.