SIM900 module 4 frequency module board GSM GPRS modules wireless data transmission over TC35

feature Quad Band 850/900/1800/1900 MHz - Can be used in GSM networks in all countries worldwide. GPRS multi-slot level 10/8 · GPRS mobile station level B. · Meet GSM phase 2/2 + Class 4 (2 W @ 850/900 MHz) Class 1 (1 W @ 1800/1900 MHz) Control via AT commands - Standard commands: GSM 07.07 & 07.05 | Enhanced commands: SIMCOM AT commands. Short Message Service - Small amounts of data (ASCII or raw hexadecimal) can be sent over the network. Embedded TCP / UDP Stack - Allows you to upload data to a web server. Support RTC. Optional serial port. · § Speaker and headphone jack Low power consumption - 1.5mA (sleep mode) Industrial Temperature Range - -40 ° C to + 85 ° C Product specifications Application concept M2M (machine 2 machine) application. Electric remote control. Remote weather station or wireless sensor network. · Vehicle tracking system with GPS module. Precautions · Make sure your SIM card is unlocked. The product is provided as is, without an insulated enclosure. Please observe the ESD precautions especially in dry (low humidity) weather. The factory default setting for the GPRS Shield UART is 19200 bps 8-N-1. (Can use the AT command to make changes). Interface introduction · § Power Selection - Select GPRS shielded power (external power or 5v arduino) Power Jack - Connect to external 4.8 ~ 5VDC power supply Antenna connector - Connects to an external antenna Serial Port Selection - Select the software serial port or hareware serial port to connect to the GPRS Shield Hardware Serial - D0 / D1 for Arduino Software Sequence - D7 / Arduino D8 ? Status LED - Indicates if the SIM900s power is on Net Light - Tell about the state of the SIM900 connected to the network UART of SIM900 - UART pin of SIM900 is separated · Microphone - answer the call Speakers - answer the call · SIM900 GPIO, PWM and ADC - GPIO, SIM900s PWM and ADC pins separate · Power button - Power on SIM900 and power down