City Wall Enterprise Co., Ltd. is a leading manufacturer & exporter of a full range of wired security alarm systems for home, office or factory use. We specially produce infrared photobeam sensors for indoor/outdoor use, control panels, auto dialers, remote control switches and accessories such as magnetic contacts, window sensors, panic button key switches and Piezo sirens. Carrison is our brand name which is also registered throughout the world. All our products have been CE approved and ISO 9002 certified by TUV. The steady quality and experienced staff can offer excellent products and the best service to our customers.