Main Features:<br />- GSM / GPRS expansion board is practical for the SIM900 Quad-band GSM / GPRS module. After adding the expansion board， Arduino can send and receive short messages， and GPRS data communication connection. Smart home choice<br />- After the plug Arduino board， you must provide 9V / 2A DC power supply. The reason is that GSM shield power supply and working up to the maximum peak current required 2A， but the USB port is unable to provide such a large current， it is necessary to supply external equipment<br />- Quad-band GSM / GPRS 850 / 900 / 1800 / 1900 MHz<br /><br />    Specifications<br />Weight and Size<br />  Product Weight: 0.048 kg                                                  <br />                        Package Weight: 0.115 kg                                                  <br />                        Product Size(L x W x H): 7.8 x 6.5 x 2.6 cm / 3.07 x 2.55 x 1.02 inches                                                  <br />                        Package Size(L x W x H): 14 x 9 x 3 cm / 5.50 x 3.54 x 1.18 inches                                                 <br />Package Contents<br />  Package Contents: 1 x Development Board，1 x Antenna                                                 <br /><br /><br /><br />                                            <br /><br /><br />                                                <br />