ShenZhen YiShi Electronic company specializes in manufacturing and marketing security and safety products, including all kinds of DVR cards,cameras and standalone dvr.Dvr cards include kodicom series,GV series,Avermedia series,picaso series,pico series, WDT series;Cameras include color camera,B/W camera,dome camera,bullet camera,integrative camera,flying disk camera,and double ccd camera.In addition we have developed a new product, telephone recording card/box,this is a new product in surveillance product area, it is developed by our own engineer.