support Dual or Quad band GSM 900/1800 MHz Raise alert by SMS and phone ... weather condition. Built-in GSM/GPRS module, support Dual or Quad band GSM 900/1800 MHz (850/1900 Optional) Raise alert by ... SpecificationGSM moduleMTK program, GSM 900/1800/850/1900 dual-band or quad-bandSupport the TCP protocolGPS ChipsetJRC high sensitive chipsetGPS sensitivity-164dBC ...