... fast replacement for batteryl High-grade protection standard Enclosure, waterproof, anti-salt, anti-sunshine, anti-immersion, ensure ... electronics environmental regulations(RoHS)l Built-in integrated GPS,VHF antennas inside transmitter make the installation and ... timeMore than 200 hours continuous workingAntennaBuilt-in VHF,GPS antennaGPS ModuleIn accordance with IEC61108-1 standardWorking Environment ...