This GPRS GSM breakout board based on the AI-Thinker A9G, which is the newest GSM GRPS Quad-Band module. You can add voice, text, SMS, and data to your project with this module. It is a high-cost performance compare with SIM800, SIM900. A9 is an ideal solution for M2M applications, suitable for automotive, industrial and PDA, personal tracking, electricity environment detection, wireless POS, smart metering, and other M2M applications, to provide comprehensive GSM / GPRS text messaging, voice and data transmission services.

Features:

Working voltage: 5v USB or Lipo battery(3.3V-4.2V)
Support the GSM / GPRS four bands, including 850,900,1800,1900MHZ
Supports digital audio and analog audio, supports HR, FR, EFR, AM R voice coding
Support voice calls and SMS messages
Embedded network service protocol stack
Support standard GSM07.07.07.05AT command

Specifications:

Model	A9G
Frequency	850/900/1800/1900MHz
GPRS Multi-Slot	Class 12
GPRS Mobile Station	Class B
Compatible with GSM	Class 4 (2W@850/ 900MHz) Class 1 (1W@1800/1900MHz)
Power Supply	3.5~4.2V typical value 4.0V
Current	1.14mA@DRX=5 1.03mA@DRX=9
AT command	3GPP TS 27.007, 27.005
Working Temperature Range (°C)	-40 to 85
Length (mm)	40
Width (mm)	25
Height (mm)	15
Weight (gm)	22