Development Board Module Kit Fit for SIM900 850/900/1800/1900 MHz GPRS/GSM Antenna, 5~26V

Specification: Power Supply:5~26V Four Frequency Range:850/900/1800 / 1900 MHz Working Temperature:-40~85? Package List: 1 x Module 1 x GSM Antenna Note: The product is provided as is without an insulating enclosure. Please observe ESD precautions specially in dry (low humidity) weather. The factory default setting for the GPRS Shield UART is 19200 bps 8-N-1. (Can be changed using AT commands). Interface Introduction: Power select - select the power supply for GPRS shield. 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 hareware serial port to be connected to GPRS Shield. Hardware Serial - D0/D1. Software serial - D7/D8. Status LED - tell whether the power of SIM900 is on. Net light - tell the status about SIM900 linking to the net. UART of SIM900 - UART pins break of SIM900. Microphone - to answer the phone call. Speaker - to answer the phone call. GPIO,PWM and ADC of SIM900 - GPIO,PWM and ADC pins break of SIM900. Power key - power up and down for SIM900.