Support Quad Band：GSM 850/EGSM 900/DCS 1800/PCS 1900
Interface : DIP type pitch 2.0mm- 2x10 pin header
RF Connector : I-PEX
Dimension： 90 x 60 mm

Quad Band：GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption.
SIM900B can fit almost all requirements in your M2M aplications.
Dimension： 40 x 33 x 3 mm
weight: 7g

The SIM900D is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications.
Support Quad Band：GSM 850/EGSM 900/DCS 1800/PCS 1900
Dimension： 33 x 33 x 3mm
weight: 6.2g

The SIM900 is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications.
Support Quad Band：GSM 850/EGSM 900/DCS 1800/PCS 1900
Dimension： 24 x 24 x 3mm
weight: 3.4g

Quad Band：GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption.
An embedded Powerful TCP/IP protocol stack
Dimension： 40 x 33 x 2.85 mm
weight: 8g

Support Quad Band：GSM 850/EGSM 900/DCS 1800/PCS 1900
Dimension：31 x 27 x 2.8 mm
Weight: 4.8 g