... ring and voice volume AC power supply Outdoor 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 ... 235mm Packing: 10-piece/carton public Payphone with GSM Double/Quad Band 900/1,800, 850/1,900MHz