Main Features:<br />On-board SIM900A dual-band 900 / 1800MHz GSM GPRS module<br />On-board LM2596 power chip<br />On-board flip SIM gets stuck， convenient for users to loading and unloading the SIM card<br />On-board terminals and DV socket， input voltage range of 7.5 - 12V<br />On-board audio interface and microphones， convenient for users to test<br />On-board UART interface<br />On-board three LED lights: Power indicator light， signal light， call light<br /><br />    Specifications<br />General<br />  Type: Development board                                                  <br />                        Model: SIM900A                                                  <br />                        Material: Copper + components                                                 <br />Electronic Components<br />  Input Voltage: 3.3V                                                 <br />Weight and Size<br />  Product Weight: 47 g                                                  <br />                        Package Weight: 0.105 kg                                                  <br />                        Product Size(L x W x H): 6.9 x 4 x 2 cm / 2.7 x 1.6 x 0.8 inches                                                  <br />                        Package Size(L x W x H): 13 x 9 x 3 cm                                                 <br />Package Contents<br />  Package Contents: 1 x Development Board， 1 x Voice Interface Antenna                                                 <br /><br /><br /><br />                                                <br />