I'm interested in a modem for a water meter with a SIM card. Frequency range of GSM modem MHz 850/1800/1900 Data transmission class GPRS class 12 Power class in the ranges 850/900 MHz 1800/1900 MHz 4(1) SIM card micro interface for programming and debugging UART TTL 3.3 V Measured readings are saved in archive with a periodicity of 1 min to 30 days Frequency of connection to the server and transmission of current and archived data from 5 min to 10 days Number of records in the archive 1024 Discrete inputs pcs 4 Pulse duration at the inputs ms not less than 100 Supply voltage from the built-in battery V 3.6 The battery life depends on the specified settings of the controller operating mode and the quality of the network from 1 year to 10 years Overall dimensions mm 140x80x30 Weight g no more than 150. Counter diameter for 50 parameters minimum 0.1 transitional Qt m/h 0.16 nominal Q m/h 25 maximum Qmax m/h 31.25, metrological class “C”, with pulse output (Translation from Russian)