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SIM900/SIM900A GSM/GPRS A6 Shield Development Board V4.0 kit 1800/900 Antenna
Item 1
Feature:* Dual-band 900/1800 MHz
* GPRS multi-slot class 10/8
* GPRS mobile station class B
* Meet GSM 2/2 standards
- Class 4 (2 W @ 900 MHz)
- Class 1 (1 W @ 1800MHz)
* Size: 24 x 24 x 3 mmControlled by AT commands(GSM 07.07, 07.05 and SIMCOM enhanced AT command set)
* SIM application toolkit
* Supply voltage range: 3.2-4.8V
* Low power consumption: 1.5mA (sleep mode)
* Operating temperature range: -40 ° C to 85 ° C.Package Included:1 x SIM900A Dual-band GSM GPRS Wireless SMS Transmission ModuleItem 2

Descriptions:100% Brand New and high quality
The GPRS Shield is based on SIM900 module from SIMCOM and compatible with Arduino and its clones.The GPRS Shield provides you a way to communicate using the GSM cell phone network.The shield 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 shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module(They are all 2V8 logic) present onboard.
Features
Quad-Band 850 / 900/ 1800 / 1900 MHz - would work on GSM networks in all countries across the world.
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 raw hexadecimal).
Embedded TCP/UDP stack - allows you to upload data to a web server.
RTC supported.
Selectable serial port.
Speaker and Headphone jacks
Low power consumption - 1.5mA(sleep mode)
Industrial Temperature Range - -40°C to 85 °C
Size:8.5x5.7x2cm(approx) Package Included:1PCS * SIM900 GPRS/GSM Shield Development Board Quand-band Module KitItem 3
Description:This is professional 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: 4.8-9VDC(On-board voltage regulator circuit supply power for A6 module)
- Working Current: maximum of 2A
- Sleep Current: 5mA
- Onboard Micro SIM card holder, you can install Micro SIM card
- Onboard Micro USB interface for external power supply
- Communication Interface: TTL serial port / RS232 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: SMA and IPX

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
- Antenna interface: SMAPackage Included: 1 x Module
1 x Antenna
Item 4
Features:

The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5--4.5V power supply, optional power on self starting (default) and control start.The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset.The size of the module is 49*50, all the new and original device.The computer can give early computer debugging USB module power supply,a very large amount of data under the condition of the recommended current more than 1A.Standby dozens of MA data can be set to providedormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.The serial port circuit: support for 3.3V single chip microcomputer.TTL serial port support3.3 and 5V single chip microcomputer.The SIM card circuit to increase the SMF05C ESD chip.Antenna circuit: guarantee short and straight, so as to ensure the signal strength.PCB display screen printing mark: each interface, convenient development two times,the SIM900/A hardware is completely follow the design when the design manual.Two power supply interface: VCC5, 5V DC above 1A.Computer 5V power supply can be early computer USB.DC long data circuit over larger recommended 5V1A.VCC4, 3.5--4.5V power supply, ibid., suitable for lithium battery.Control pin all leads.A TTL level, compatible with 3.3V and 5V.The two antenna interface, the default SMA straight head, connector for IPXmini antenna.One way of speech interface, the way Mike interface.The control interface of each pin description:GND - GNDSIMR SIM900A RXD, TTL level,can not be directly connected to the 232 levelSIMT SIM900A TXD, TTL level,can not be directly connected to the 232 levelRST - SIM900A reset,active lowVCC_MCU when the SIM900A module and 5V TTL level communication,this pin is connected to DC 5V;when the level of communication of SIM900A and 3.3V TTL,this pin is connected to DC 3.3V.VCC5----DC 5V input.VCC4------DC3.5--4.5 inputOnboard Resources:Serial port circuit(with protection)Antenna interface circuit(SMA bend female port)SIM card circuit(flip SIM slot)4*3.5 fixture hole 4pcsSIM900A serial port output terminal

Specifications:

Size:49mm x 47mmNet Weight:28gWeight: 38gPackage Included:
1 x SIM900A V4.0 Kit 1800/1900 MHz Wireless Extension Module GSM GPRS Board Antenna
Free cableItem 5
Specification:

The GPRS Shield is based on SIM900 module from SIMCOM and compatible with Arduino and its clones. The GPRS Shield provides you a way to communicate using the GSM cell phone network. The shield 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 shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module(They are all 2V8 logic) present onboard.Feature:

1. Quad-Band 850 / 900/ 1800 / 1900 MHz - would work on GSM networks in all countries across the world.2. GPRS multi-slot class 10/83. GPRS mobile station class B4. Compliant to GSM phase 2/2 5. Class 4 (2 W (AT) 850 / 900 MHz)6. Class 1 (1 W (AT) 1800 / 1900MHz)7. Control via AT commands - Standard Commands: GSM 07.07 & 07.05 | Enhanced Commands: SIMCOM AT Commands.8. Short Message Service - so that you can send small amounts of data over the network (ASCII or raw hexadecimal).9. Embedded TCP/UDP stack - allows you to upload data to a web server.10. RTC supported.11. Selectable serial port.12. Speaker and Headphone jacks13. Low power consumption - 1.5mA(sleep mode)14. Industrial Temperature Range - -40°C to 85 °CPackage included :Item 6 Product descripton:
100% Brand New and high quality
The GPRS Shield is based on SIM900 module from SIMCOM and compatible with Arduino and its clones.The GPRS Shield provides you a way to communicate using the GSM cell phone network.The shield 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 shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module(They are all 2V8 logic) present onboard.FeaturesQuad-Band 900/1800 MHz - would work on GSM networks in all countries across the world.
GPRS multi-slot class 10/8
GPRS mobile station class B
Compliant to GSM phase 2/2
Class 4 (2 W @ 900 MHz)
Class 1 (1 W @ 1800 MHz)
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 raw hexadecimal).
Embedded TCP/UDP stack - allows you to upload data to a web server.
RTC supported.
Selectable serial port.
Speaker and Headphone jacks
Low power consumption - 1.5mA(sleep mode)
Industrial Temperature Range - -40°C to 85 °C
Size:8.5x5.7x2cm(approx) Package Included:1PCS * SIM900 900/1800 MHz GPRS/GSM Development Board Module For Arduino

Item 7
Features: The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5--4.5V power supply, optional power on self starting (default) and control start.The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset.The size of the module is 49*50, all the new and original device.The computer can give early computer debugging USB module power supply,a very large amount of data under the condition of the recommended current more than 1A.Standby dozens of MA data can be set to providedormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.The serial port circuit: support for 3.3V single chip microcomputer.TTL serial port support3.3 and 5V single chip microcomputer.The SIM card circuit to increase the SMF05C ESD chip.Antenna circuit: guarantee short and straight, so as to ensure the signal strength.PCB display screen printing mark: each interface, convenient development two times,the SIM900/A hardware is completely follow the design when the design manual.Two power supply interface: VCC5, 5V DC above 1A.Computer 5V power supply can be early computer USB.DC long data circuit over larger recommended 5V1A.VCC4, 3.5--4.5V power supply, ibid., suitable for lithium battery.Control pin all leads.A TTL level, compatible with 3.3V and 5V.The two antenna interface, the default SMA straight head, connector for IPXmini antenna.One way of speech interface, the way Mike interface.The control interface of each pin description:GND - GNDSIMR SIM900A RXD, TTL level,can not be directly connected to the 232 levelSIMT SIM900A TXD, TTL level,can not be directly connected to the 232 levelRST - SIM900A reset,active lowVCC_MCU when the SIM900A module and 5V TTL level communication,this pin is connected to DC 5V;when the level of communication of SIM900A and 3.3V TTL,this pin is connected to DC 3.3V.VCC5----DC 5V input.VCC4------DC3.5--4.5 inputOnboard Resources:Serial port circuit(with protection)Antenna interface circuit(SMA bend female port)SIM card circuit(flip SIM slot)4*3.5 fixture hole 4pcsSIM900A serial port output terminal Specifications: Size:49mm x 47mmNet Weight:28gWeight: 38g Package Included:1 x SIM900 850/900/1800/1900 MHz Wireless Extension Module GSM GPRS Board Antenna Free cableItem 8Overview
Gboard Pro is a unique Arduino mainboard with SIM900 GSM / GPRS module, XBee socket, nRF24L01 module interface, micro SD card interface, ITDB02 parallel LCD module interface, electronic brick interface and ATmega2560 chips, which can achieve wireless control via XBee, nRF24L01 or GSM / GPRS with functions covering from smart home to remote control of robots to meet various needs of different projects.

Specifications:
PCB size:131.0mm X 68.8mm X 1.6mm
Supply voltage:7~23V DC
Operating voltage:3.3V DC
Microprocessor:ATmega2560
Indicators:PWR，NET，Status，Test
Communication interfaces:XBee，nRF24L01 ，UART，IIC，ITDB02 LCD，micro SDPackage Included:1 x Gboard Pro GSM/GPRS SIM900 Development Board ATmega2560 Microprocessor Payment
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