... External antenna,to 7m -2G/3G,BarCord, GPS handheld smart card reader Introduction & feature:Completely self-owned brand. Independent R&D ... 1900 MHzInterfaceExternal port:USB 2.0,RS232,RJ45adaptorExtend port:1pcs SD/MMC card slot,1pcs SIM card slot,1pcs PSAM card slotBattery parameterCapacity: ... software upgrading or online technology upgrading; Newest handheld smart card reader with Exteal antenna 7m