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This is mini version serial GSM / GPRS core development board based on GPRS A6 module. 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 3mA in sleep mode. It communicates with microcontroller via UART port£¬ supports command including GSM 07.07£¬ GSM 07.05 and Ai-Thinker enhanced AT Commands. Features: - Working frequency: quad-band network£¬ 850 / 900 / 1800 / 1900MHZ - Working voltage: 4.5-5.2VDC - Working Current: maximum of 2A - Sleep Current: 5mA - Onboard Micro SIM card holder£¬ you can install Micro SIM card - Communication Interface: TTL serial port - Baud rate: 115200bps and it can also be set by AT command. - Interface logic voltage: 3.3V - Make and answer phone calls using a headset and electret microphone. - Send and receive SMS messages. - Send and receive GPRS data (TCP/IP£¬ HTTP£¬ etc.) . - Be used to test the Ai-Thinker GPRS A6 module - Pin pitch: 2.54mm - Onboard antenna interface: IPX and pad for spring antenna About the Antenna: - Suitable for SIM800L GSM modules / Arduino SIM900 GPRS Shield - Frequency: 780MHz~960MHz£¬ 1710MHz~2170MHz - Antenna gain: +2.0 ± 0.7 dBi @ 880 MHz£¬ +2.0 ± 0.7 dBi @ 1800 MHz - S.W.R <= 2.0 @ 2100 MHz ~ 2500 MHz - Output Impedance: 50 Ohm - Usage: It can be soldered directly to the board.