... antenna Speaker phone Optional accessories available for greater convenience and enhanced functionality Easy service and repairTechnical specifications: GSM double-band ... 900/1,800, 850/1,900MHz or Quad-band 850/900/1,800/1,900MHz Environment temperature: ... Packing: 10-piece/carton public Payphone with GSM Double/Quad Band 900/1,800, 850/1,900MHz