GPRS/GSM Development Board Quad Band Module With Antenna Descriptions: The GPRS board is based on module from SIMCOM and compatible with standard development board. The GPRS board provides you a way to communicate using the GSM cell phone network. The board allows you to achieve SMS, MMS, GPRS and Audio via UART by sending AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands). The board also has the 12 GPIOs, 2 PWMs and an ADC of the module(They are all 2V8 logic) present onboard. Features: GPRS wireless module, 4-band module is available world. GPRS board is a four-band GPRS / GSM module, and support Quad-Band 850 / 900/ 1800 / 1900 MHz. The GPRS board is based on module and compatible with standard standard development board. It is applicable both at home and abroad, allow you send SMS messages, phone calls, GPRS and other mobile phone functions. GPRS board is a serial GSM/GPRS wireless module. Can learn GSM/GPRS mobile phone development, remote control equipment development, wireless meter reading, smart home appliance, ultra-long distance control, etc. GPRS multi-slot class 10/8 GPRS mobile station class B Compliant to GSM phase 2/2+ Class 4 (2 W 850 / 900 MHz) Class 1 (1 W 1800 / 1900MHz) Control via AT commands - Standard Commands: GSM 07.07 & 07.05 | Enhanced Commands: SIMCOM AT Commands. Short Message Service - so that you can send small amounts of data over the network (ASCII or hexadecimal). Embedded UDP stack, allows you to upload data to a web server. RTC supported. Selectable serial port. Speaker and headphone jacks. Specifications: Sleep mode power consumption: 1.5mA Industrial Temperature Range : -40°C ~ 85 °C Size: approx 8.5 x 5.7 x 2cm/3.35 x2.24 x 0.79inch Weight: 41g Interface Introduction: Power select: select the power supply for GPRS  Power jack: connected to external 4.8~5VDC power supply Antenna interface: connected to external antenna Serial port select: select either software serial port or hardware serial port to be connected to Package Included: 1 x GPRS/ GSM Development Board Note: 1.Make sure your SIM card is unlocked. 2.The product is provided as is without an insulating enclosure. Please observe ESD precautions specially in dry (low humidity) weather. 3.The factory default setting for the GPRS board UART is 19200 bps 8-N-1. (Can be changed using AT commands).