Supply Huawei MG323-B Shu GSM / GPRS module supports four frequency bands: GSM / GPRS: 850 MHz / 900 MHz / 1800 MHz / 1900 MHz maximum transmit power GSM850 Class 4 (2 W) EGSM900 Class 4 (2 W) GSM1800 Class 1 (1 W) GSM1900 Class 1 (1 W) receiver sensitivity <-107 dBm Operating temperature normal operating temperature: -20 ° C ~ + 70 ° C operating temperature limits: -30 ° C ~ -20 ° C and + 70 ° C ~ + 75 ° C Storage Temperature -40 ° C ~ + 85 ° C Supply Voltage 3.3 V ~ 4.2 V (recommended value 3.8 V) power (current) shutdown current: 50 μA standby current average MFRMS = 2 I <3.0 mA MFRMS = 5 I <3.0 mA MFRMS = 9 I <3.0 mA GPRS class 10 (maximum): Itypical = 460 mA protocol supports GSM / GPRS Phase2 / 2 + AT commands, refer to "HUAWEI MG323-B GSM LCC module AT command manual "Application Interface (68- pin LCC interface) UART 1 interface (supports 8-wire serial interface) and UART 0 interface (supports 2-wire serial interface) standard SIM card interface (3 V, 1.8 V) two-channel analog audio interface Power Interface network status indicator Light control interface antenna connector antenna pad supports two analog voice short message service support new voice to wake up, to receive support: read, delete, store state, the list of supported PDU mode GPRS GPRS CLASS 10 encoding CS 1, CS 2, CS 3, CS 4 maximum downlink transmission rate: 85.6 kbps maximum uplink transmission rate: 42.8 kbps PBCCH support embedded TCP / IP protocol, support multi-link circuit domain data service support CSD data service, the highest rate of up to 9.6 kbps Physical Characteristics Dimensions: 24 mm X 24 mm X 2.95 mm Weight: <3.5 g authentication information ROHS (Restriction of the use of certain Hazardous Substances) CE (European Conformity) CCC (China Compulsory Certification)