GSM built-in antenna Specification: Frequency: 824 894/1710 1990MHz 880 960/1710 1990MHz 1920 2170MHz V. S. W. R: 2.0: 1 Impedance: 50ohm Gain: 2dBi Polarization Type: Vertical or Horizontal Cable: RG174 or others Connector: SMA/MCX or others Environment storagetemperature -45 +100°C workingtemperature-40 +85°CRelative humidity 40% 95%