... the clients can develop its special monitoring center according to the communication protocol directly over wireless GPRS network.The ... ;3.Power Plant, transmission Substation, power towers;4.Distribution Grid, transmission grid, power substation;5.The switch tower and ... 18hours (depending on the network condition)Relative Humidity: 10 to 90%, No condensationGSM Band: 850,900,1800,1900MhzGSM ...