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Waveshare SIM808 GSM / GPRS / GPS 3G Shield for Arduino - Blue
1.SIM808 module 2.MIC29302 power chip 3.CP2102: USB TO UART converter 4.SMF05C: TVS diode 5.1N5408: onboard rectifier 6.SIM808 functional pins 7.Arduino expansion connector 8.USB TO UART interface 9.DC power jack 10.GPS antenna connector 11.Bluetooth antenna connector 12.Firmware upgrade interface 13.GSM antenna connector 14.SIM card slot 15.3.5mm earphone/mic jack 16.GPS status indicator 17.CP2102 UART Tx/Rx indicator 18.NET indicator: flashes fast when the module starts up flashes slowly after GSM register succeed 19.Power indicator 20.Power switch 21.SIM808 control button: press the button and hold for 1s£¬ to startup/shutdown the SIM808 22.Reset button 23.UART selection switch£¬ select controlling the SIM808 via: CP2102 UART pins of Arduino interface 24.SIM808 UART configuration: SIM_TX: SIM808 UART TX SIM_RX: SIM808 UART RX