Portman Security established in 1987. Has dedicated to GPS/GPRS,electronic vehicle security and building security. Portman‘s production base is in Dongguan , China. With competitive price and strong quality control, Portman has won its way to 40 countries. Advanced and reliable products are Portman‘s goal. During years experience on OEM and ODM cases, Portman has built up its name in this business. A 150％ annual increase proved the acceptance of Portman.