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Feature
Power supply:   5V ～ 16V
Power saving:  Typical power consumption in sleep mode is 70mW( BS-PA-MFRMS=9)
Frequency bands:
 G20 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. G20 can search the 4 frequency bands automatically. The frequency bands also can be set by AT command " AT+CBAND" :
 Compliant to GSM Phase 2/2+
Transmitting Power:
 Class 4(2W) at GSM 850 and EGSM 900
 Class 1(1W) at DCS 1800 and PCS 1900
GPRS connectivity:
 GPRS multi-slot class 10 (default)
 GPRS multi-slot class 8 (option)
Temperature range:
 Normal operation: -30℃～+80℃
 Restricted operation: -40℃～-30℃ and +80℃～+85℃﹡
 Storage temperature: -45℃～+90℃
Data GPRS:
 GPRS data downlink transfer: max.85.6kbps
 GPRS data uplink transfer: max.42.8kbps
 Coding scheme: CS-1, CS-2, CS-3 and CS-4
 Integrate the TCP/IP protocol
 Support Packet Broadcast Control Channel (PBCCH)
CSD: Support CSD transmission
USSD: Unstructured Supplementary Services Data (USSD) support
SMS:
 MT, MO, CB, Text and PDU mode
 SMS storage: SIM card
FA: Group 3 Class 1
SIM interface: Support SIM card: 1.8V, 3V
External antenna: SMA type RF connector 
Audio features:
Speech codec modes:
  Half Rate (ETS 06.20)
  Full Rate (ETS 06.10)
  Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
  Adaptive multi rate (AMR)
  Echo Cancellation
  Noise Suppression

RS232 serial port
 Serial port
 Full modem interface with status and control lines, unbalanced  asynchronous.
 1200bps to 115200bps.
 Can be used for AT commands data stream.
 Support RTS/CTS hardware handshake and software flow control.
 Multiplex ability according to GSM 07.10 Multiplexer Protocol.
 Autobauding supports baud rate from 1200 bps to 57600 bps.
SIM  Toolkit
GSM 11.14 Release 99

Physical characteristics
Size: 98*60*22mm
Weight: 125g
Firmware upgrade