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SIM900A Dual-band Network Mini Serial GPRS GSM Breakout Module
This is mini GSM / GPRS core board based on SIM900A. It supports dual-band GSM/GPRS network£¬ available for GPRS and SMS message data remote transmission. The board features compact size and low current consumption. With power saving technique£¬ the current consumption is as low as 4mA in sleep mode. It communicates with microcontroller via UART port£¬ supports command including GSM 07.07£¬ GSM 07.05 and SIMCOM enhanced AT Commands. Features: - Working frequency: 900MHz / 1800MHz. - Working voltage: 4.4 ~ 5.3VDC - Working Current: maximum of 2A£¬ an average of 50mA - Sleep Current: 4mA - Communication Interface: TTL serial port - Baud rate: It can be set to be auto-bauding and it can also be set by AT command. - Interface logic voltage: 3.3V - Make and answer phone calls using a headset or an external 8Ω speaker and electret microphone. - Send and receive SMS messages. - Send and receive GPRS data (TCP/IP£¬ HTTP£¬ etc.) .