... 900,1800,1900MHZ OEM/ODM: Accept Customer logo: Accept Application: home, office, factory and so on Warranty: One year Specifications 1 ... .Internal MIC & speakers 4.SMS,auto dial GSM alarm function Wireless GSM alarm system , and on the high quality all the time ,Cheap is ... need installation by technician; 4. Can be used in any home, unattended equipment room, communication or network base station; 5. ...