... ship GPS trackerProduct image: Configuration:Standard configuration: GPS main device, panic button, installation cables.Optional accessories: built-in backup battery, relay for stop ... :Class 4(2w@850/900MHZ)Class 1(1w@1800/1900MHZ)GPS performanceSiRF star III, support WAASFrequency:L1,1575.42MHZGPS sensitivity: -159dbChannels ...